[PATCH spice 3/11] server: Refactor the Spice server video encoding so alternative implementations can be added.

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This patch simply replaces the mjpeg_encoder_xxx() call points with a 
more object oriented design.
---
 server/Makefile.am     |   2 +-
 server/mjpeg_encoder.c | 134 +++++++++++++++++++++++++++++++++++++---
 server/mjpeg_encoder.h | 114 ----------------------------------
 server/red_worker.c    | 156 ++++++++++++++---------------------------------
 server/video_encoder.h | 162 +++++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 331 insertions(+), 237 deletions(-)
 delete mode 100644 server/mjpeg_encoder.h
 create mode 100644 server/video_encoder.h

diff --git a/server/Makefile.am b/server/Makefile.am
index 89a375c..36b6d45 100644
--- a/server/Makefile.am
+++ b/server/Makefile.am
@@ -81,7 +81,6 @@ libspice_server_la_SOURCES =			\
 	main_channel.c				\
 	main_channel.h				\
 	mjpeg_encoder.c				\
-	mjpeg_encoder.h				\
 	red_bitmap_utils.h			\
 	red_channel.c				\
 	red_channel.h				\
@@ -115,6 +114,7 @@ libspice_server_la_SOURCES =			\
 	spicevmc.c				\
 	spice_timer_queue.c			\
 	spice_timer_queue.h			\
+	video_encoder.h				\
 	zlib_encoder.c				\
 	zlib_encoder.h				\
 	spice_bitmap_utils.h		\
diff --git a/server/mjpeg_encoder.c b/server/mjpeg_encoder.c
index 9a41ef3..d734520 100644
--- a/server/mjpeg_encoder.c
+++ b/server/mjpeg_encoder.c
@@ -20,7 +20,11 @@
 #endif
 
 #include "red_common.h"
-#include "mjpeg_encoder.h"
+
+typedef struct MJpegEncoder MJpegEncoder;
+#define VIDEO_ENCODER_T MJpegEncoder
+#include "video_encoder.h"
+
 #include <jerror.h>
 #include <jpeglib.h>
 #include <inttypes.h>
@@ -154,6 +158,7 @@ typedef struct MJpegEncoderRateControl {
 } MJpegEncoderRateControl;
 
 struct MJpegEncoder {
+    VideoEncoder base;
     uint8_t *row;
     uint32_t row_size;
     int first_frame;
@@ -165,7 +170,7 @@ struct MJpegEncoder {
     void (*pixel_converter)(uint8_t *src, uint8_t *dest);
 
     MJpegEncoderRateControl rate_control;
-    MJpegEncoderRateControlCbs cbs;
+    VideoEncoderRateControlCbs cbs;
     void *cbs_opaque;
 
     /* stats */
@@ -174,6 +179,22 @@ struct MJpegEncoder {
     uint32_t num_frames;
 };
 
+static void mjpeg_encoder_destroy(MJpegEncoder *encoder);
+static int mjpeg_encoder_encode_frame(MJpegEncoder *encoder,
+                const SpiceBitmap *bitmap, int width, int height,
+                const SpiceRect *src, int top_down, uint32_t frame_mm_time,
+                uint8_t **outbuf, size_t *outbuf_size, int *data_size);
+static void mjpeg_encoder_client_stream_report(MJpegEncoder *encoder,
+                                        uint32_t num_frames,
+                                        uint32_t num_drops,
+                                        uint32_t start_frame_mm_time,
+                                        uint32_t end_frame_mm_time,
+                                        int32_t end_frame_delay,
+                                        uint32_t audio_delay);
+static void mjpeg_encoder_notify_server_frame_drop(MJpegEncoder *encoder);
+static uint64_t mjpeg_encoder_get_bit_rate(MJpegEncoder *encoder);
+static void mjpeg_encoder_get_stats(MJpegEncoder *encoder, VideoEncoderStats *stats);
+
 static inline void mjpeg_encoder_reset_quality(MJpegEncoder *encoder,
                                                int quality_id,
                                                uint32_t fps,
@@ -189,8 +210,9 @@ static inline int rate_control_is_active(MJpegEncoder* encoder)
     return encoder->cbs.get_roundtrip_ms != NULL;
 }
 
-MJpegEncoder *mjpeg_encoder_new(uint64_t starting_bit_rate,
-                                MJpegEncoderRateControlCbs *cbs, void *opaque)
+MJpegEncoder *create_mjpeg_encoder(uint64_t starting_bit_rate,
+                                   VideoEncoderRateControlCbs *cbs,
+                                   void *cbs_opaque)
 {
     MJpegEncoder *enc;
 
@@ -198,6 +220,12 @@ MJpegEncoder *mjpeg_encoder_new(uint64_t starting_bit_rate,
 
     enc = spice_new0(MJpegEncoder, 1);
 
+    enc->base.destroy = &mjpeg_encoder_destroy;
+    enc->base.encode_frame = &mjpeg_encoder_encode_frame;
+    enc->base.client_stream_report = &mjpeg_encoder_client_stream_report;
+    enc->base.notify_server_frame_drop = &mjpeg_encoder_notify_server_frame_drop;
+    enc->base.get_bit_rate = &mjpeg_encoder_get_bit_rate;
+    enc->base.get_stats = &mjpeg_encoder_get_stats;
     enc->first_frame = TRUE;
     enc->rate_control.byte_rate = starting_bit_rate / 8;
     enc->starting_bit_rate = starting_bit_rate;
@@ -207,7 +235,7 @@ MJpegEncoder *mjpeg_encoder_new(uint64_t starting_bit_rate,
 
         clock_gettime(CLOCK_MONOTONIC, &time);
         enc->cbs = *cbs;
-        enc->cbs_opaque = opaque;
+        enc->cbs_opaque = cbs_opaque;
         mjpeg_encoder_reset_quality(enc, MJPEG_QUALITY_SAMPLE_NUM / 2, 5, 0);
         enc->rate_control.during_quality_eval = TRUE;
         enc->rate_control.quality_eval_data.type = MJPEG_QUALITY_EVAL_TYPE_SET;
@@ -754,7 +782,7 @@ int mjpeg_encoder_start_frame(MJpegEncoder *encoder, SpiceBitmapFmt format,
         interval = (now - rate_control->bit_rate_info.last_frame_time);
 
         if (interval < (1000*1000*1000) / rate_control->adjusted_fps) {
-            return MJPEG_ENCODER_FRAME_DROP;
+            return VIDEO_ENCODER_FRAME_DROP;
         }
 
         mjpeg_encoder_adjust_params_to_bit_rate(encoder);
@@ -802,14 +830,14 @@ int mjpeg_encoder_start_frame(MJpegEncoder *encoder, SpiceBitmapFmt format,
         break;
     default:
         spice_debug("unsupported format %d", format);
-        return MJPEG_ENCODER_FRAME_UNSUPPORTED;
+        return VIDEO_ENCODER_FRAME_UNSUPPORTED;
     }
 
     if (encoder->pixel_converter != NULL) {
         unsigned int stride = width * 3;
         /* check for integer overflow */
         if (stride < width) {
-            return MJPEG_ENCODER_FRAME_UNSUPPORTED;
+            return VIDEO_ENCODER_FRAME_UNSUPPORTED;
         }
         if (encoder->row_size < stride) {
             encoder->row = spice_realloc(encoder->row, stride);
@@ -829,7 +857,7 @@ int mjpeg_encoder_start_frame(MJpegEncoder *encoder, SpiceBitmapFmt format,
 
     encoder->num_frames++;
     encoder->avg_quality += quality;
-    return MJPEG_ENCODER_FRAME_ENCODE_START;
+    return VIDEO_ENCODER_FRAME_ENCODE_DONE;
 }
 
 int mjpeg_encoder_encode_scanline(MJpegEncoder *encoder, uint8_t *src_pixels,
@@ -888,6 +916,92 @@ size_t mjpeg_encoder_end_frame(MJpegEncoder *encoder)
     return encoder->rate_control.last_enc_size;
 }
 
+static inline uint8_t *get_image_line(SpiceChunks *chunks, size_t *offset,
+                                          int *chunk_nr, int stride)
+{
+    uint8_t *ret;
+    SpiceChunk *chunk;
+
+    chunk = &chunks->chunk[*chunk_nr];
+
+    if (*offset == chunk->len) {
+        if (*chunk_nr == chunks->num_chunks - 1) {
+            return NULL; /* Last chunk */
+        }
+        *offset = 0;
+        (*chunk_nr)++;
+        chunk = &chunks->chunk[*chunk_nr];
+    }
+
+    if (chunk->len - *offset < stride) {
+        spice_warning("bad chunk alignment");
+        return NULL;
+    }
+    ret = chunk->data + *offset;
+    *offset += stride;
+    return ret;
+}
+
+
+
+static int encode_mjpeg_frame(MJpegEncoder *encoder, const SpiceRect *src,
+                        const SpiceBitmap *image, int top_down)
+{
+    SpiceChunks *chunks;
+    uint32_t image_stride;
+    size_t offset;
+    int i, chunk;
+
+    chunks = image->data;
+    offset = 0;
+    chunk = 0;
+    image_stride = image->stride;
+
+    const int skip_lines = top_down ? src->top : image->y - (src->bottom - 0);
+    for (i = 0; i < skip_lines; i++) {
+            get_image_line(chunks, &offset, &chunk, image_stride);
+    }
+
+    const unsigned int stream_height = src->bottom - src->top;
+    const unsigned int stream_width = src->right - src->left;
+
+    for (i = 0; i < stream_height; i++) {
+        uint8_t *src_line = (uint8_t *)get_image_line(chunks, &offset, &chunk, image_stride);
+
+        if (!src_line) {
+            return FALSE;
+        }
+
+        src_line += src->left * mjpeg_encoder_get_bytes_per_pixel(encoder);
+        if (mjpeg_encoder_encode_scanline(encoder, src_line, stream_width) == 0)
+            return FALSE;
+    }
+
+    return TRUE;
+}
+
+int mjpeg_encoder_encode_frame(MJpegEncoder *encoder,
+                const SpiceBitmap *bitmap, int width, int height,
+                const SpiceRect *src, int top_down, uint32_t frame_mm_time,
+                uint8_t **outbuf, size_t *outbuf_size, int *data_size)
+{
+    int ret;
+
+    ret = mjpeg_encoder_start_frame(encoder, bitmap->format,
+                                    width, height, outbuf, outbuf_size,
+                                    frame_mm_time);
+    if (ret != VIDEO_ENCODER_FRAME_ENCODE_DONE)
+        return ret;
+
+    if (!encode_mjpeg_frame(encoder, src, bitmap, top_down))
+        return VIDEO_ENCODER_FRAME_UNSUPPORTED;
+
+    *data_size = mjpeg_encoder_end_frame(encoder);
+
+    return VIDEO_ENCODER_FRAME_ENCODE_DONE;
+}
+
+
 static void mjpeg_encoder_quality_eval_stop(MJpegEncoder *encoder)
 {
     MJpegEncoderRateControl *rate_control = &encoder->rate_control;
@@ -1267,7 +1381,7 @@ uint64_t mjpeg_encoder_get_bit_rate(MJpegEncoder *encoder)
     return encoder->rate_control.byte_rate * 8;
 }
 
-void mjpeg_encoder_get_stats(MJpegEncoder *encoder, MJpegEncoderStats *stats)
+void mjpeg_encoder_get_stats(MJpegEncoder *encoder, VideoEncoderStats *stats)
 {
     spice_assert(encoder != NULL && stats != NULL);
     stats->starting_bit_rate = encoder->starting_bit_rate;
diff --git a/server/mjpeg_encoder.h b/server/mjpeg_encoder.h
deleted file mode 100644
index d584b92..0000000
--- a/server/mjpeg_encoder.h
+++ /dev/null
@@ -1,114 +0,0 @@
-/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
-/*
-   Copyright (C) 2009 Red Hat, Inc.
-
-   This library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   This library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this library; if not, see <http://www.gnu.org/licenses/>.
-*/
-
-#ifndef _H_MJPEG_ENCODER
-#define _H_MJPEG_ENCODER
-
-#include "red_common.h"
-
-enum {
-    MJPEG_ENCODER_FRAME_UNSUPPORTED = -1,
-    MJPEG_ENCODER_FRAME_DROP,
-    MJPEG_ENCODER_FRAME_ENCODE_START,
-};
-
-typedef struct MJpegEncoder MJpegEncoder;
-
-/*
- * Callbacks required for controling and adjusting
- * the stream bit rate:
- * get_roundtrip_ms: roundtrip time in milliseconds
- * get_source_fps: the input frame rate (#frames per second), i.e.,
- * the rate of frames arriving from the guest to spice-server,
- * before any drops.
- */
-typedef struct MJpegEncoderRateControlCbs {
-    uint32_t (*get_roundtrip_ms)(void *opaque);
-    uint32_t (*get_source_fps)(void *opaque);
-    void (*update_client_playback_delay)(void *opaque, uint32_t delay_ms);
-} MJpegEncoderRateControlCbs;
-
-typedef struct MJpegEncoderStats {
-    uint64_t starting_bit_rate;
-    uint64_t cur_bit_rate;
-    double avg_quality;
-} MJpegEncoderStats;
-
-MJpegEncoder *mjpeg_encoder_new(uint64_t starting_bit_rate,
-                                MJpegEncoderRateControlCbs *cbs, void *opaque);
-void mjpeg_encoder_destroy(MJpegEncoder *encoder);
-
-uint8_t mjpeg_encoder_get_bytes_per_pixel(MJpegEncoder *encoder);
-
-/*
- * dest must be either NULL or allocated by malloc, since it might be freed
- * during the encoding, if its size is too small.
- *
- * return:
- *  MJPEG_ENCODER_FRAME_UNSUPPORTED : frame cannot be encoded
- *  MJPEG_ENCODER_FRAME_DROP        : frame should be dropped. This value can only be returned
- *                                    if mjpeg rate control is active.
- *  MJPEG_ENCODER_FRAME_ENCODE_START: frame encoding started. Continue with
- *                                    mjpeg_encoder_encode_scanline.
- */
-int mjpeg_encoder_start_frame(MJpegEncoder *encoder, SpiceBitmapFmt format,
-                              int width, int height,
-                              uint8_t **dest, size_t *dest_len,
-                              uint32_t frame_mm_time);
-int mjpeg_encoder_encode_scanline(MJpegEncoder *encoder, uint8_t *src_pixels,
-                                  size_t image_width);
-size_t mjpeg_encoder_end_frame(MJpegEncoder *encoder);
-
-/*
- * bit rate control
- */
-
-/*
- * Data that should be periodically obtained from the client. The report contains:
- * num_frames         : the number of frames that reached the client during the time
- *                      the report is referring to.
- * num_drops          : the part of the above frames that was dropped by the client due to
- *                      late arrival time.
- * start_frame_mm_time: the mm_time of the first frame included in the report
- * end_frame_mm_time  : the mm_time of the last_frame included in the report
- * end_frame_delay    : (end_frame_mm_time - client_mm_time)
- * audio delay        : the latency of the audio playback.
- *                      If there is no audio playback, set it to MAX_UINT.
- *
- */
-void mjpeg_encoder_client_stream_report(MJpegEncoder *encoder,
-                                        uint32_t num_frames,
-                                        uint32_t num_drops,
-                                        uint32_t start_frame_mm_time,
-                                        uint32_t end_frame_mm_time,
-                                        int32_t end_frame_delay,
-                                        uint32_t audio_delay);
-
-/*
- * Notify the encoder each time a frame is dropped due to pipe
- * congestion.
- * We can deduce the client state by the frame dropping rate in the server.
- * Monitoring the frame drops can help in fine tuning the playback parameters
- * when the client reports are delayed.
- */
-void mjpeg_encoder_notify_server_frame_drop(MJpegEncoder *encoder);
-
-uint64_t mjpeg_encoder_get_bit_rate(MJpegEncoder *encoder);
-void mjpeg_encoder_get_stats(MJpegEncoder *encoder, MJpegEncoderStats *stats);
-
-#endif
diff --git a/server/red_worker.c b/server/red_worker.c
index e0ff8e9..c6b39cb 100644
--- a/server/red_worker.c
+++ b/server/red_worker.c
@@ -70,7 +70,7 @@
 #include "glz_encoder.h"
 #include "stat.h"
 #include "reds.h"
-#include "mjpeg_encoder.h"
+#include "video_encoder.h"
 #include "red_memslots.h"
 #include "red_parse_qxl.h"
 #include "jpeg_encoder.h"
@@ -484,7 +484,7 @@ typedef struct StreamAgent {
     PipeItem destroy_item;
     Stream *stream;
     uint64_t last_send_time;
-    MJpegEncoder *mjpeg_encoder;
+    VideoEncoder *video_encoder;
     DisplayChannelClient *dcc;
 
     int frames;
@@ -723,7 +723,7 @@ struct DisplayChannelClient {
     QRegion surface_client_lossy_region[NUM_SURFACES];
 
     StreamAgent stream_agents[NUM_STREAMS];
-    int use_mjpeg_encoder_rate_control;
+    int use_video_encoder_rate_control;
     uint32_t streams_max_latency;
     uint64_t streams_max_bit_rate;
 };
@@ -2642,10 +2642,10 @@ static void red_print_stream_stats(DisplayChannelClient *dcc, StreamAgent *agent
 #ifdef STREAM_STATS
     StreamStats *stats = &agent->stats;
     double passed_mm_time = (stats->end - stats->start) / 1000.0;
-    MJpegEncoderStats encoder_stats = {0};
+    VideoEncoderStats encoder_stats = {0};
 
-    if (agent->mjpeg_encoder) {
-        mjpeg_encoder_get_stats(agent->mjpeg_encoder, &encoder_stats);
+    if (agent->video_encoder) {
+        agent->video_encoder->get_stats(agent->video_encoder, &encoder_stats);
     }
 
     spice_debug("stream=%"PRIdPTR" dim=(%dx%d) #in-frames=%"PRIu64" #in-avg-fps=%.2f #out-frames=%"PRIu64" "
@@ -2688,8 +2688,8 @@ static void red_stop_stream(RedWorker *worker, Stream *stream)
         region_clear(&stream_agent->vis_region);
         region_clear(&stream_agent->clip);
         spice_assert(!pipe_item_is_linked(&stream_agent->destroy_item));
-        if (stream_agent->mjpeg_encoder && dcc->use_mjpeg_encoder_rate_control) {
-            uint64_t stream_bit_rate = mjpeg_encoder_get_bit_rate(stream_agent->mjpeg_encoder);
+        if (stream_agent->video_encoder && dcc->use_video_encoder_rate_control) {
+            uint64_t stream_bit_rate = stream_agent->video_encoder->get_bit_rate(stream_agent->video_encoder);
 
             if (stream_bit_rate > dcc->streams_max_bit_rate) {
                 spice_debug("old max-bit-rate=%.2f new=%.2f",
@@ -2996,7 +2996,7 @@ static uint64_t red_stream_get_initial_bit_rate(DisplayChannelClient *dcc,
            stream->width * stream->height) / dcc->common.worker->streams_size_total;
 }
 
-static uint32_t red_stream_mjpeg_encoder_get_roundtrip(void *opaque)
+static uint32_t red_stream_video_encoder_get_roundtrip(void *opaque)
 {
     StreamAgent *agent = opaque;
     int roundtrip;
@@ -3017,7 +3017,7 @@ static uint32_t red_stream_mjpeg_encoder_get_roundtrip(void *opaque)
     return roundtrip;
 }
 
-static uint32_t red_stream_mjpeg_encoder_get_source_fps(void *opaque)
+static uint32_t red_stream_video_encoder_get_source_fps(void *opaque)
 {
     StreamAgent *agent = opaque;
 
@@ -3040,7 +3040,7 @@ static void red_display_update_streams_max_latency(DisplayChannelClient *dcc, St
     }
     for (i = 0; i < NUM_STREAMS; i++) {
         StreamAgent *other_agent = &dcc->stream_agents[i];
-        if (other_agent == remove_agent || !other_agent->mjpeg_encoder) {
+        if (other_agent == remove_agent || !other_agent->video_encoder) {
             continue;
         }
         if (other_agent->client_required_latency > new_max_latency) {
@@ -3053,9 +3053,9 @@ static void red_display_update_streams_max_latency(DisplayChannelClient *dcc, St
 static void red_display_stream_agent_stop(DisplayChannelClient *dcc, StreamAgent *agent)
 {
     red_display_update_streams_max_latency(dcc, agent);
-    if (agent->mjpeg_encoder) {
-        mjpeg_encoder_destroy(agent->mjpeg_encoder);
-        agent->mjpeg_encoder = NULL;
+    if (agent->video_encoder) {
+        agent->video_encoder->destroy(agent->video_encoder);
+        agent->video_encoder = NULL;
     }
 }
 
@@ -3091,18 +3091,18 @@ static void red_display_create_stream(DisplayChannelClient *dcc, Stream *stream)
     agent->fps = MAX_FPS;
     agent->dcc = dcc;
 
-    if (dcc->use_mjpeg_encoder_rate_control) {
-        MJpegEncoderRateControlCbs mjpeg_cbs;
+    if (dcc->use_video_encoder_rate_control) {
+        VideoEncoderRateControlCbs video_cbs;
         uint64_t initial_bit_rate;
 
-        mjpeg_cbs.get_roundtrip_ms = red_stream_mjpeg_encoder_get_roundtrip;
-        mjpeg_cbs.get_source_fps = red_stream_mjpeg_encoder_get_source_fps;
-        mjpeg_cbs.update_client_playback_delay = red_stream_update_client_playback_latency;
+        video_cbs.get_roundtrip_ms = red_stream_video_encoder_get_roundtrip;
+        video_cbs.get_source_fps = red_stream_video_encoder_get_source_fps;
+        video_cbs.update_client_playback_delay = red_stream_update_client_playback_latency;
 
         initial_bit_rate = red_stream_get_initial_bit_rate(dcc, stream);
-        agent->mjpeg_encoder = mjpeg_encoder_new(initial_bit_rate, &mjpeg_cbs, agent);
+        agent->video_encoder = create_mjpeg_encoder(initial_bit_rate, &video_cbs, agent);
     } else {
-        agent->mjpeg_encoder = mjpeg_encoder_new(0, NULL, NULL);
+        agent->video_encoder = create_mjpeg_encoder(0, NULL, NULL);
     }
     red_channel_client_pipe_add(&dcc->common.base, &agent->create_item);
 
@@ -3209,7 +3209,7 @@ static void red_display_client_init_streams(DisplayChannelClient *dcc)
         red_channel_pipe_item_init(channel, &agent->create_item, PIPE_ITEM_TYPE_STREAM_CREATE);
         red_channel_pipe_item_init(channel, &agent->destroy_item, PIPE_ITEM_TYPE_STREAM_DESTROY);
     }
-    dcc->use_mjpeg_encoder_rate_control =
+    dcc->use_video_encoder_rate_control =
         red_channel_client_test_remote_cap(&dcc->common.base, SPICE_DISPLAY_CAP_STREAM_REPORT);
 }
 
@@ -3221,9 +3221,9 @@ static void red_display_destroy_streams_agents(DisplayChannelClient *dcc)
         StreamAgent *agent = &dcc->stream_agents[i];
         region_destroy(&agent->vis_region);
         region_destroy(&agent->clip);
-        if (agent->mjpeg_encoder) {
-            mjpeg_encoder_destroy(agent->mjpeg_encoder);
-            agent->mjpeg_encoder = NULL;
+        if (agent->video_encoder) {
+            agent->video_encoder->destroy(agent->video_encoder);
+            agent->video_encoder = NULL;
         }
     }
 }
@@ -3350,7 +3350,7 @@ static inline void pre_stream_item_swap(RedWorker *worker, Stream *stream, Drawa
         dcc = dpi->dcc;
         agent = &dcc->stream_agents[index];
 
-        if (!dcc->use_mjpeg_encoder_rate_control &&
+        if (!dcc->use_video_encoder_rate_control &&
             !dcc->common.is_low_bandwidth) {
             continue;
         }
@@ -3359,8 +3359,8 @@ static inline void pre_stream_item_swap(RedWorker *worker, Stream *stream, Drawa
 #ifdef STREAM_STATS
             agent->stats.num_drops_pipe++;
 #endif
-            if (dcc->use_mjpeg_encoder_rate_control) {
-                mjpeg_encoder_notify_server_frame_drop(agent->mjpeg_encoder);
+            if (dcc->use_video_encoder_rate_control) {
+                agent->video_encoder->notify_server_frame_drop(agent->video_encoder);
             } else {
                 ++agent->drops;
             }
@@ -3373,7 +3373,7 @@ static inline void pre_stream_item_swap(RedWorker *worker, Stream *stream, Drawa
 
         agent = &dcc->stream_agents[index];
 
-        if (dcc->use_mjpeg_encoder_rate_control) {
+        if (dcc->use_video_encoder_rate_control) {
             continue;
         }
         if (agent->frames / agent->fps < FPS_TEST_INTERVAL) {
@@ -8481,70 +8481,6 @@ static inline void display_begin_send_message(RedChannelClient *rcc)
     red_channel_client_begin_send_message(rcc);
 }
 
-static inline uint8_t *red_get_image_line(SpiceChunks *chunks, size_t *offset,
-                                          int *chunk_nr, int stride)
-{
-    uint8_t *ret;
-    SpiceChunk *chunk;
-
-    chunk = &chunks->chunk[*chunk_nr];
-
-    if (*offset == chunk->len) {
-        if (*chunk_nr == chunks->num_chunks - 1) {
-            return NULL; /* Last chunk */
-        }
-        *offset = 0;
-        (*chunk_nr)++;
-        chunk = &chunks->chunk[*chunk_nr];
-    }
-
-    if (chunk->len - *offset < stride) {
-        spice_warning("bad chunk alignment");
-        return NULL;
-    }
-    ret = chunk->data + *offset;
-    *offset += stride;
-    return ret;
-}
-
-static int encode_frame(DisplayChannelClient *dcc, const SpiceRect *src,
-                        const SpiceBitmap *image, Stream *stream)
-{
-    SpiceChunks *chunks;
-    uint32_t image_stride;
-    size_t offset;
-    int i, chunk;
-    StreamAgent *agent = &dcc->stream_agents[stream - dcc->common.worker->streams_buf];
-
-    chunks = image->data;
-    offset = 0;
-    chunk = 0;
-    image_stride = image->stride;
-
-    const int skip_lines = stream->top_down ? src->top : image->y - (src->bottom - 0);
-    for (i = 0; i < skip_lines; i++) {
-        red_get_image_line(chunks, &offset, &chunk, image_stride);
-    }
-
-    const unsigned int stream_height = src->bottom - src->top;
-    const unsigned int stream_width = src->right - src->left;
-
-    for (i = 0; i < stream_height; i++) {
-        uint8_t *src_line =
-            (uint8_t *)red_get_image_line(chunks, &offset, &chunk, image_stride);
-
-        if (!src_line) {
-            return FALSE;
-        }
-
-        src_line += src->left * mjpeg_encoder_get_bytes_per_pixel(agent->mjpeg_encoder);
-        if (mjpeg_encoder_encode_scanline(agent->mjpeg_encoder, src_line, stream_width) == 0)
-            return FALSE;
-    }
-
-    return TRUE;
-}
-
 static inline int red_marshall_stream_data(RedChannelClient *rcc,
                   SpiceMarshaller *base_marshaller, Drawable *drawable)
 {
@@ -8589,7 +8525,7 @@ static inline int red_marshall_stream_data(RedChannelClient *rcc,
     uint64_t time_now = red_now();
     size_t outbuf_size;
 
-    if (!dcc->use_mjpeg_encoder_rate_control) {
+    if (!dcc->use_video_encoder_rate_control) {
         if (time_now - agent->last_send_time < (1000 * 1000 * 1000) / agent->fps) {
             agent->frames--;
 #ifdef STREAM_STATS
@@ -8603,33 +8539,29 @@ static inline int red_marshall_stream_data(RedChannelClient *rcc,
     frame_mm_time =  drawable->red_drawable->mm_time ?
                         drawable->red_drawable->mm_time :
                         reds_get_mm_time();
+
     outbuf_size = dcc->send_data.stream_outbuf_size;
-    ret = mjpeg_encoder_start_frame(agent->mjpeg_encoder, image->u.bitmap.format,
-                                    width, height,
-                                    &dcc->send_data.stream_outbuf,
-                                    &outbuf_size,
-                                    frame_mm_time);
+    ret = agent->video_encoder->encode_frame(agent->video_encoder,
+            &image->u.bitmap, width, height,
+            &drawable->red_drawable->u.copy.src_area,
+            stream->top_down, frame_mm_time,
+            &dcc->send_data.stream_outbuf, &outbuf_size, &n);
+
     switch (ret) {
-    case MJPEG_ENCODER_FRAME_DROP:
-        spice_assert(dcc->use_mjpeg_encoder_rate_control);
+    case VIDEO_ENCODER_FRAME_DROP:
+        spice_assert(dcc->use_video_encoder_rate_control);
 #ifdef STREAM_STATS
         agent->stats.num_drops_fps++;
 #endif
         return TRUE;
-    case MJPEG_ENCODER_FRAME_UNSUPPORTED:
+    case VIDEO_ENCODER_FRAME_UNSUPPORTED:
         return FALSE;
-    case MJPEG_ENCODER_FRAME_ENCODE_START:
+    case VIDEO_ENCODER_FRAME_ENCODE_DONE:
         break;
     default:
-        spice_error("bad return value (%d) from mjpeg_encoder_start_frame", ret);
-        return FALSE;
-    }
-
-    if (!encode_frame(dcc, &drawable->red_drawable->u.copy.src_area,
-                      &image->u.bitmap, stream)) {
+        spice_error("bad return value (%d) from VideoEncoder::encode_frame", ret);
         return FALSE;
     }
-    n = mjpeg_encoder_end_frame(agent->mjpeg_encoder);
     dcc->send_data.stream_outbuf_size = outbuf_size;
 
     if (!drawable->sized_stream) {
@@ -10255,7 +10187,7 @@ static int display_channel_handle_stream_report(DisplayChannelClient *dcc,
         return FALSE;
     }
     stream_agent = &dcc->stream_agents[stream_report->stream_id];
-    if (!stream_agent->mjpeg_encoder) {
+    if (!stream_agent->video_encoder) {
         spice_info("stream_report: no encoder for stream id %u."
                     "Probably the stream has been destroyed", stream_report->stream_id);
         return TRUE;
@@ -10266,7 +10198,7 @@ static int display_channel_handle_stream_report(DisplayChannelClient *dcc,
                       stream_agent->report_id, stream_report->unique_id);
         return TRUE;
     }
-    mjpeg_encoder_client_stream_report(stream_agent->mjpeg_encoder,
+    stream_agent->video_encoder->client_stream_report(stream_agent->video_encoder,
                                        stream_report->num_frames,
                                        stream_report->num_drops,
                                        stream_report->start_frame_mm_time,
diff --git a/server/video_encoder.h b/server/video_encoder.h
new file mode 100644
index 0000000..8a9f9c6
--- /dev/null
+++ b/server/video_encoder.h
@@ -0,0 +1,162 @@
+/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/*
+   Copyright (C) 2009 Red Hat, Inc.
+   Copyright (C) 2015 Jeremy White
+   Copyright (C) 2015 Francois Gouget
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, see <<A HREF="http://www.gnu.org/licenses/";>http://www.gnu.org/licenses/</A>>.
+*/
+
+#ifndef _H_video_encoder
+#define _H_video_encoder
+
+#include "red_common.h"
+
+enum {
+    VIDEO_ENCODER_FRAME_UNSUPPORTED = -1,
+    VIDEO_ENCODER_FRAME_DROP,
+    VIDEO_ENCODER_FRAME_ENCODE_DONE,
+};
+
+typedef struct VideoEncoderStats {
+    uint64_t starting_bit_rate;
+    uint64_t cur_bit_rate;
+    double avg_quality;
+} VideoEncoderStats;
+
+typedef struct VideoEncoder VideoEncoder;
+#ifndef VIDEO_ENCODER_T
+# define VIDEO_ENCODER_T VideoEncoder
+#endif
+
+struct VideoEncoder {
+    /* Releases the video encoder's resources */
+    void (*destroy)(VIDEO_ENCODER_T *encoder);
+
+    /* Compresses the specified src image area into the outbuf buffer.
+     *
+     * @encoder:   The video encoder.
+     * @bitmap:    The Spice screen.
+     * @width:     The width of the Spice screen.
+     * @height:    The heigth of the Spice screen.
+     * @src:       A rectangle specifying the area occupied by the video.
+     * @top_down:  If true the first video line is specified by src.top.
+     * @outbuf:    The buffer for the compressed frame. This must either be
+     *             NULL or point to a buffer allocated by malloc since it may be
+     *             reallocated, if its size is too small.
+     * @outbuf_size: The size of the outbuf buffer.
+     * @data_size: The size of the compressed frame.
+     * @return:
+     *     VIDEO_ENCODER_FRAME_ENCODE_DONE if successful.
+     *     VIDEO_ENCODER_FRAME_UNSUPPORTED if the frame cannot be encoded.
+     *     VIDEO_ENCODER_FRAME_DROP if the frame was dropped. This value can
+     *                              only hapen if rate control is active.
+     */
+    int (*encode_frame)(VIDEO_ENCODER_T *encoder, const SpiceBitmap *bitmap,
+                        int width, int height, const SpiceRect *src,
+                        int top_down, uint32_t frame_mm_time,uint8_t **outbuf,
+                        size_t *outbuf_size, int *data_size);
+
+    /*
+     * Bit rate control methods.
+     */
+
+    /* When rate control is active statistics are periodically obtained from
+     * the client and sent to the video encoder through this method.
+     *
+     * @encoder:    The video encoder.
+     * @num_frames: The number of frames that reached the client during the
+     *              time period the report is referring to.
+     * @num_drops:  The part of the above frames that was dropped by the client
+     *              due to late arrival time.
+     * @start_frame_mm_time: The mm_time of the first frame included in the
+     *              report.
+     * @end_frame_mm_time: The mm_time of the last frame included in the report.
+     * @end_frame_delay: (end_frame_mm_time - client_mm_time)
+     * @audio delay: The latency of the audio playback. If there is no audio
+     *              playback this is MAX_UINT.
+     *
+     */
+    void (*client_stream_report)(VIDEO_ENCODER_T *encoder,
+                                 uint32_t num_frames, uint32_t num_drops,
+                                 uint32_t start_frame_mm_time,
+                                 uint32_t end_frame_mm_time,
+                                 int32_t end_frame_delay, uint32_t audio_delay);
+
+    /* This notifies the video encoder each time a frame is dropped due to pipe
+     * congestion.
+     *
+     * We can deduce the client state by the frame dropping rate in the server.
+     * Monitoring the frame drops can help in fine tuning the playback
+     * parameters when the client reports are delayed.
+     *
+     * @encoder:    The video encoder.
+     */
+    void (*notify_server_frame_drop)(VIDEO_ENCODER_T *encoder);
+
+    /* This queries the video encoder's current bit rate.
+     *
+     * @encoder:    The video encoder.
+     * @return:     The current bit rate in bits per second.
+     */
+    uint64_t (*get_bit_rate)(VIDEO_ENCODER_T *encoder);
+
+    /* Collects video statistics.
+     *
+     * @encoder:    The video encoder.
+     * @stats:      A VideoEncoderStats structure to fill with the collected
+     *              statistics.
+     */
+    void (*get_stats)(VIDEO_ENCODER_T *encoder, VideoEncoderStats *stats);
+};
+
+
+/* When rate control is active the video encoder can use these callbacks to
+ * figure out how to adjust the stream bit rate and adjust some stream
+ * parameters.
+ */
+typedef struct VideoEncoderRateControlCbs {
+    /* Returns the stream's estimated roundtrip time in milliseconds. */
+    uint32_t (*get_roundtrip_ms)(void *opaque);
+
+    /* Returns the estimated input frame rate.
+     *
+     * This is the number of frames per second arriving from the guest to
+     * spice-server, before any drops.
+     */
+    uint32_t (*get_source_fps)(void *opaque);
+
+    /* Informs the client of the minimum playback delay.
+     *
+     * @delay_ms:   The minimum number of milliseconds required for the frames
+     *              to reach the client.
+     */
+    void (*update_client_playback_delay)(void *opaque, uint32_t delay_ms);
+} VideoEncoderRateControlCbs;
+
+
+/* Instantiates the builtin MJPEG video encoder.
+ *
+ * @starting_bit_rate: An initial estimate of the available stream bit rate .
+ * @bit_rate_control:  True if the client supports rate control.
+ * @cbs:               A set of callback methods to be used for rate control.
+ * @cbs_opaque:        A pointer to be passed to the rate control callbacks.
+ * @return:            A pointer to a structure implementing the VideoEncoder
+ *                     methods.
+ */
+VIDEO_ENCODER_T* create_mjpeg_encoder(uint64_t starting_bit_rate,
+                                      VideoEncoderRateControlCbs *cbs,
+                                      void *cbs_opaque);
+
+#endif
-- 
2.1.4

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