flash video (flv) support patch by (Garrick Meeker <gmeeker at theoryllc dot com>)

Originally committed as revision 2024 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 381 insertions, 0 deletions

diff --git a/libavformat/flvenc.c b/libavformat/flvenc.c
new file mode 100644
index 0000000000..b717bbb163
--- /dev/null
+++ b/libavformat/flvenc.c
@@ -0,0 +1,381 @@
+/*
+ * FLV encoder.
+ * Copyright (c) 2003 The FFmpeg Project.
+ *
+ * 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 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include "avformat.h"
+
+#define VIDEO_FIFO_SIZE 512
+
+typedef struct FLVFrame {
+    int type;
+    int timestamp;
+    int flags;
+    uint8_t *data;
+    int size;
+    struct FLVFrame *next;
+} FLVFrame;
+
+typedef struct FLVContext {
+    int hasAudio;
+    int hasVideo;
+#ifdef CONFIG_MP3LAME
+    int audioTime;
+    int audioInPos;
+    int audioOutPos;
+    int audioSize;
+    int audioRate;
+    int initDelay;
+    int soundDelay;
+    uint8_t *audioFifo;
+    int64_t sampleCount;
+#endif // CONFIG_MP3LAME
+    int64_t frameCount;
+    FLVFrame *frames;
+} FLVContext;
+
+
+#ifdef CONFIG_MP3LAME
+
+#define AUDIO_FIFO_SIZE 65536
+
+static const int sSampleRates[3][4] = {
+    {44100, 48000, 32000, 0},
+    {22050, 24000, 16000, 0},
+    {11025, 12000,  8000, 0},
+};
+
+static const int sBitRates[2][3][15] = {
+    {   {  0, 32, 64, 96,128,160,192,224,256,288,320,352,384,416,448},
+        {  0, 32, 48, 56, 64, 80, 96,112,128,160,192,224,256,320,384},
+        {  0, 32, 40, 48, 56, 64, 80, 96,112,128,160,192,224,256,320}
+    },
+    {   {  0, 32, 48, 56, 64, 80, 96,112,128,144,160,176,192,224,256},
+        {  0,  8, 16, 24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160},
+        {  0,  8, 16, 24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160}
+    },
+};
+
+static const int sSamplesPerFrame[3][3] =
+{
+    {  384,     1152,    1152 },
+    {  384,     1152,     576 },
+    {  384,     1152,     576 }
+};
+
+static const int sBitsPerSlot[3] = {
+    32,
+    8,
+    8
+};
+
+static int mp3info(void *data, int *byteSize, int *samplesPerFrame, int *sampleRate, int *isMono )
+{
+    uint8_t *dataTmp = (uint8_t *)data;
+    uint32_t header = ( (uint32_t)dataTmp[0] << 24 ) | ( (uint32_t)dataTmp[1] << 16 ) | ( (uint32_t)dataTmp[2] << 8 ) | (uint32_t)dataTmp[3];
+    int layerID = 3 - ((header >> 17) & 0x03);
+    int bitRateID = ((header >> 12) & 0x0f);
+    int sampleRateID = ((header >> 10) & 0x03);
+    int bitRate = 0;
+    int bitsPerSlot = sBitsPerSlot[layerID];
+    int isPadded = ((header >> 9) & 0x01);
+
+    if ( (( header >> 21 ) & 0x7ff) != 0x7ff ) {
+        return 0;
+    }
+
+    if ( !isPadded ) {
+        printf("Fatal error: mp3 data is not padded!\n");
+        exit(0);
+    }
+
+    *isMono = ((header >>  6) & 0x03) == 0x03;
+
+    if ( (header >> 19 ) & 0x01 ) {
+        *sampleRate = sSampleRates[0][sampleRateID];
+        bitRate = sBitRates[0][layerID][bitRateID] * 1000;
+        *samplesPerFrame = sSamplesPerFrame[0][layerID];
+
+    } else {
+        if ( (header >> 20) & 0x01 ) {
+            *sampleRate = sSampleRates[1][sampleRateID];
+            bitRate = sBitRates[1][layerID][bitRateID] * 1000;
+            *samplesPerFrame = sSamplesPerFrame[1][layerID];
+        } else {
+            *sampleRate = sSampleRates[2][sampleRateID];
+            bitRate = sBitRates[1][layerID][bitRateID] * 1000;
+            *samplesPerFrame = sSamplesPerFrame[2][layerID];
+        }
+    }
+
+    *byteSize = ( ( ( ( *samplesPerFrame * (bitRate / bitsPerSlot) ) / *sampleRate ) + isPadded ) * bitsPerSlot);
+
+    return 1;
+}
+#endif // CONFIG_MP3LAME
+
+static int flv_write_header(AVFormatContext *s)
+{
+    ByteIOContext *pb = &s->pb;
+    FLVContext *flv = s->priv_data;
+
+    av_set_pts_info(s, 24, 1, 1000); /* 24 bit pts in ms */
+
+    flv->hasAudio = 0;
+    flv->hasVideo = 0;
+
+#ifdef CONFIG_MP3LAME
+    flv->audioTime = -1;
+    flv->audioFifo = av_malloc(AUDIO_FIFO_SIZE);
+    flv->audioInPos = 0;
+    flv->audioOutPos = 0;
+    flv->audioSize = 0;
+    flv->audioRate = 44100;
+    flv->initDelay = -1;
+    flv->soundDelay = 0;
+#endif // CONFIG_MP3LAME
+
+    flv->frames = 0;
+
+    put_tag(pb,"FLV");
+    put_byte(pb,1);
+    put_byte(pb,0); // delayed write
+    put_be32(pb,9);
+    put_be32(pb,0);
+
+    return 0;
+}
+
+static void put_be24(ByteIOContext *pb, int value)
+{
+    put_byte(pb, (value>>16) & 0xFF );
+    put_byte(pb, (value>> 8) & 0xFF );
+    put_byte(pb, (value>> 0) & 0xFF );
+}
+
+static void InsertSorted(FLVContext *flv, FLVFrame *frame)
+{
+    if ( !flv->frames ) {
+        flv->frames = frame;
+    } else {
+        FLVFrame *trav = flv->frames;
+        FLVFrame *prev = 0;
+        for (;trav;) {
+            if ( trav->timestamp >= frame->timestamp ) {
+                frame->next = trav;
+                if ( prev ) {
+                    prev->next = frame;
+                } else {
+                    flv->frames = frame;
+                }
+                break;
+            }
+            prev = trav;
+            trav = trav->next;
+        }
+        if ( !trav ) {
+            prev->next = frame;
+        }
+    }
+}
+
+static void DumpFrame(ByteIOContext *pb, FLVFrame *frame)
+{
+    put_byte(pb,frame->type); // message type
+    put_be24(pb,frame->size+1); // include flags
+    put_be24(pb,frame->timestamp); // time stamp
+    put_be32(pb,0); // reserved
+    put_byte(pb,frame->flags);
+    put_buffer(pb, frame->data, frame->size);
+    put_be32(pb,frame->size+1+11); // reserved
+    av_free(frame->data);
+}
+
+static void Dump(FLVContext *flv, ByteIOContext *pb, int count)
+{
+    int c=0;
+    FLVFrame *trav = flv->frames;
+    FLVFrame *prev = 0;
+    for (;trav;c++) {
+        trav = trav->next;
+    }
+    trav = flv->frames;
+    for ( ; c >= count; c-- ) {
+        DumpFrame(pb,trav);
+        prev = trav;
+        trav = trav->next;
+        av_free(prev);
+    }
+     flv->frames = trav;
+}
+
+static int flv_write_trailer(AVFormatContext *s)
+{
+    ByteIOContext *pb = &s->pb;
+    FLVContext *flv = s->priv_data;
+
+    Dump(flv,pb,1);
+
+    int64_t file_size = url_ftell(pb);
+    int flags = 0;
+    flags |= flv->hasAudio ? 4 : 0;
+    flags |= flv->hasVideo ? 1 : 0;
+    url_fseek(pb, 4, SEEK_SET);
+    put_byte(pb,flags);
+    url_fseek(pb, file_size, SEEK_SET);
+    return 0;
+}
+
+static int flv_write_packet(AVFormatContext *s, int stream_index,
+                            uint8_t *buf, int size, int timestamp)
+{
+    ByteIOContext *pb = &s->pb;
+    AVCodecContext *enc = &s->streams[stream_index]->codec;
+    FLVContext *flv = s->priv_data;
+
+    if (enc->codec_type == CODEC_TYPE_VIDEO) {
+        FLVFrame *frame = av_malloc(sizeof(FLVFrame));
+        frame->next = 0;
+        frame->type = 9;
+        frame->flags = 2; // choose h263
+        frame->flags |= enc->coded_frame->key_frame ? 0x10 : 0x20; // add keyframe indicator
+        frame->timestamp = timestamp;
+        //frame->timestamp = ( ( flv->frameCount * (int64_t)FRAME_RATE_BASE * (int64_t)1000 ) / (int64_t)enc->frame_rate );
+        //printf("%08x %f %f\n",frame->timestamp,(double)enc->frame_rate/(double)FRAME_RATE_BASE,1000*(double)FRAME_RATE_BASE/(double)enc->frame_rate);
+        frame->size = size;
+        frame->data = av_malloc(size);
+        memcpy(frame->data,buf,size);
+        flv->hasVideo = 1;
+
+        InsertSorted(flv,frame);
+
+        flv->frameCount ++;
+    }
+    else if (enc->codec_type == CODEC_TYPE_AUDIO) {
+#ifdef CONFIG_MP3LAME
+        if (enc->codec_id == CODEC_ID_MP3LAME ) {
+            int c=0;
+            for (;c<size;c++) {
+                flv->audioFifo[(flv->audioOutPos+c)%AUDIO_FIFO_SIZE] = buf[c];
+            }
+            flv->audioSize += size;
+            flv->audioOutPos += size;
+            flv->audioOutPos %= AUDIO_FIFO_SIZE;
+
+            if ( flv->initDelay == -1 ) {
+                flv->initDelay = timestamp;
+            }
+
+            if ( flv->audioTime == -1 ) {
+                flv->audioTime = timestamp;
+//                flv->audioTime = ( ( ( flv->sampleCount - enc->delay ) * 8000 ) / flv->audioRate ) - flv->initDelay - 250;
+//                if ( flv->audioTime < 0 ) {
+//                    flv->audioTime = 0;
+//                }
+            }
+        }
+        for ( ; flv->audioSize >= 4 ; ) {
+
+            int mp3FrameSize = 0;
+            int mp3SampleRate = 0;
+            int mp3IsMono = 0;
+            int mp3SamplesPerFrame = 0;
+
+            if ( mp3info(&flv->audioFifo[flv->audioInPos],&mp3FrameSize,&mp3SamplesPerFrame,&mp3SampleRate,&mp3IsMono) ) {
+                if ( flv->audioSize >= mp3FrameSize ) {
+
+                    int soundFormat = 0x22;
+                    int c=0;
+                    FLVFrame *frame = av_malloc(sizeof(FLVFrame));
+
+                    flv->audioRate = mp3SampleRate;
+
+                    switch (mp3SampleRate) {
+                        case    44100:
+                            soundFormat |= 0x0C;
+                            break;
+                        case    22050:
+                            soundFormat |= 0x08;
+                            break;
+                        case    11025:
+                            soundFormat |= 0x04;
+                            break;
+                    }
+
+                    if ( !mp3IsMono ) {
+                        soundFormat |= 0x01;
+                    }
+
+                    frame->next = 0;
+                    frame->type = 8;
+                    frame->flags = soundFormat;
+                    frame->timestamp = flv->audioTime;
+                    frame->size = mp3FrameSize;
+                    frame->data = av_malloc(mp3FrameSize);
+
+                    for (;c<mp3FrameSize;c++) {
+                        frame->data[c] = flv->audioFifo[(flv->audioInPos+c)%AUDIO_FIFO_SIZE];
+                    }
+
+                    flv->audioInPos += mp3FrameSize;
+                    flv->audioSize -= mp3FrameSize;
+                    flv->audioInPos %= AUDIO_FIFO_SIZE;
+                    flv->sampleCount += mp3SamplesPerFrame;
+
+                    // Reset audio for next round
+                    flv->audioTime = -1;
+                    // We got audio! Make sure we set this to the global flags on closure
+                    flv->hasAudio = 1;
+
+                    InsertSorted(flv,frame);
+                }
+                break;
+            }
+            flv->audioInPos ++;
+            flv->audioSize --;
+            flv->audioInPos %= AUDIO_FIFO_SIZE;
+            // no audio in here!
+            flv->audioTime = -1;
+        }
+#endif
+    }
+    Dump(flv,pb,128);
+    put_flush_packet(pb);
+    return 0;
+}
+
+static AVOutputFormat flv_oformat = {
+    "flv",
+    "flv format",
+    "video/x-flashvideo",
+    "flv",
+    sizeof(FLVContext),
+#ifdef CONFIG_MP3LAME
+    CODEC_ID_MP3LAME,
+#else // CONFIG_MP3LAME
+    CODEC_ID_NONE,
+#endif // CONFIG_MP3LAME
+    CODEC_ID_FLV1,
+    flv_write_header,
+    flv_write_packet,
+    flv_write_trailer,
+};
+
+int flvenc_init(void)
+{
+    av_register_output_format(&flv_oformat);
+    return 0;
+}