diff options
Diffstat (limited to 'contrib/ffmpeg/libavformat/swf.c')
| -rw-r--r-- | contrib/ffmpeg/libavformat/swf.c | 944 |
1 files changed, 944 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavformat/swf.c b/contrib/ffmpeg/libavformat/swf.c new file mode 100644 index 000000000..6029e3678 --- /dev/null +++ b/contrib/ffmpeg/libavformat/swf.c @@ -0,0 +1,944 @@ +/* + * Flash Compatible Streaming Format + * Copyright (c) 2000 Fabrice Bellard. + * Copyright (c) 2003 Tinic Uro. + * + * This file is part of FFmpeg. + * + * FFmpeg 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. + * + * FFmpeg 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 FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ +#include "avformat.h" +#include "bitstream.h" +#include "riff.h" /* for CodecTag */ + +/* should have a generic way to indicate probable size */ +#define DUMMY_FILE_SIZE (100 * 1024 * 1024) +#define DUMMY_DURATION 600 /* in seconds */ + +#define TAG_END 0 +#define TAG_SHOWFRAME 1 +#define TAG_DEFINESHAPE 2 +#define TAG_FREECHARACTER 3 +#define TAG_PLACEOBJECT 4 +#define TAG_REMOVEOBJECT 5 +#define TAG_STREAMHEAD 18 +#define TAG_STREAMBLOCK 19 +#define TAG_JPEG2 21 +#define TAG_PLACEOBJECT2 26 +#define TAG_STREAMHEAD2 45 +#define TAG_VIDEOSTREAM 60 +#define TAG_VIDEOFRAME 61 + +#define TAG_LONG 0x100 + +/* flags for shape definition */ +#define FLAG_MOVETO 0x01 +#define FLAG_SETFILL0 0x02 +#define FLAG_SETFILL1 0x04 + +#define AUDIO_FIFO_SIZE 65536 + +/* character id used */ +#define BITMAP_ID 0 +#define VIDEO_ID 0 +#define SHAPE_ID 1 + +#undef NDEBUG +#include <assert.h> + +typedef struct { + + offset_t duration_pos; + offset_t tag_pos; + + int samples_per_frame; + int sound_samples; + int video_samples; + int swf_frame_number; + int video_frame_number; + int ms_per_frame; + int ch_id; + int tag; + + uint8_t *audio_fifo; + int audio_in_pos; + int audio_out_pos; + int audio_size; + + int video_type; + int audio_type; +} SWFContext; + +static const CodecTag swf_codec_tags[] = { + {CODEC_ID_FLV1, 0x02}, + {CODEC_ID_VP6F, 0x04}, + {0, 0}, +}; + +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 swf_mp3_info(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; + } + + *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 ) ); + + return 1; +} + +#ifdef CONFIG_MUXERS +static void put_swf_tag(AVFormatContext *s, int tag) +{ + SWFContext *swf = s->priv_data; + ByteIOContext *pb = &s->pb; + + swf->tag_pos = url_ftell(pb); + swf->tag = tag; + /* reserve some room for the tag */ + if (tag & TAG_LONG) { + put_le16(pb, 0); + put_le32(pb, 0); + } else { + put_le16(pb, 0); + } +} + +static void put_swf_end_tag(AVFormatContext *s) +{ + SWFContext *swf = s->priv_data; + ByteIOContext *pb = &s->pb; + offset_t pos; + int tag_len, tag; + + pos = url_ftell(pb); + tag_len = pos - swf->tag_pos - 2; + tag = swf->tag; + url_fseek(pb, swf->tag_pos, SEEK_SET); + if (tag & TAG_LONG) { + tag &= ~TAG_LONG; + put_le16(pb, (tag << 6) | 0x3f); + put_le32(pb, tag_len - 4); + } else { + assert(tag_len < 0x3f); + put_le16(pb, (tag << 6) | tag_len); + } + url_fseek(pb, pos, SEEK_SET); +} + +static inline void max_nbits(int *nbits_ptr, int val) +{ + int n; + + if (val == 0) + return; + val = abs(val); + n = 1; + while (val != 0) { + n++; + val >>= 1; + } + if (n > *nbits_ptr) + *nbits_ptr = n; +} + +static void put_swf_rect(ByteIOContext *pb, + int xmin, int xmax, int ymin, int ymax) +{ + PutBitContext p; + uint8_t buf[256]; + int nbits, mask; + + init_put_bits(&p, buf, sizeof(buf)); + + nbits = 0; + max_nbits(&nbits, xmin); + max_nbits(&nbits, xmax); + max_nbits(&nbits, ymin); + max_nbits(&nbits, ymax); + mask = (1 << nbits) - 1; + + /* rectangle info */ + put_bits(&p, 5, nbits); + put_bits(&p, nbits, xmin & mask); + put_bits(&p, nbits, xmax & mask); + put_bits(&p, nbits, ymin & mask); + put_bits(&p, nbits, ymax & mask); + + flush_put_bits(&p); + put_buffer(pb, buf, pbBufPtr(&p) - p.buf); +} + +static void put_swf_line_edge(PutBitContext *pb, int dx, int dy) +{ + int nbits, mask; + + put_bits(pb, 1, 1); /* edge */ + put_bits(pb, 1, 1); /* line select */ + nbits = 2; + max_nbits(&nbits, dx); + max_nbits(&nbits, dy); + + mask = (1 << nbits) - 1; + put_bits(pb, 4, nbits - 2); /* 16 bits precision */ + if (dx == 0) { + put_bits(pb, 1, 0); + put_bits(pb, 1, 1); + put_bits(pb, nbits, dy & mask); + } else if (dy == 0) { + put_bits(pb, 1, 0); + put_bits(pb, 1, 0); + put_bits(pb, nbits, dx & mask); + } else { + put_bits(pb, 1, 1); + put_bits(pb, nbits, dx & mask); + put_bits(pb, nbits, dy & mask); + } +} + +#define FRAC_BITS 16 + +/* put matrix */ +static void put_swf_matrix(ByteIOContext *pb, + int a, int b, int c, int d, int tx, int ty) +{ + PutBitContext p; + uint8_t buf[256]; + int nbits; + + init_put_bits(&p, buf, sizeof(buf)); + + put_bits(&p, 1, 1); /* a, d present */ + nbits = 1; + max_nbits(&nbits, a); + max_nbits(&nbits, d); + put_bits(&p, 5, nbits); /* nb bits */ + put_bits(&p, nbits, a); + put_bits(&p, nbits, d); + + put_bits(&p, 1, 1); /* b, c present */ + nbits = 1; + max_nbits(&nbits, c); + max_nbits(&nbits, b); + put_bits(&p, 5, nbits); /* nb bits */ + put_bits(&p, nbits, c); + put_bits(&p, nbits, b); + + nbits = 1; + max_nbits(&nbits, tx); + max_nbits(&nbits, ty); + put_bits(&p, 5, nbits); /* nb bits */ + put_bits(&p, nbits, tx); + put_bits(&p, nbits, ty); + + flush_put_bits(&p); + put_buffer(pb, buf, pbBufPtr(&p) - p.buf); +} + +/* */ +static int swf_write_header(AVFormatContext *s) +{ + SWFContext *swf; + ByteIOContext *pb = &s->pb; + AVCodecContext *enc, *audio_enc, *video_enc; + PutBitContext p; + uint8_t buf1[256]; + int i, width, height, rate, rate_base; + + swf = av_malloc(sizeof(SWFContext)); + if (!swf) + return -1; + s->priv_data = swf; + + swf->ch_id = -1; + swf->audio_in_pos = 0; + swf->audio_out_pos = 0; + swf->audio_size = 0; + swf->audio_fifo = av_malloc(AUDIO_FIFO_SIZE); + swf->sound_samples = 0; + swf->video_samples = 0; + swf->swf_frame_number = 0; + swf->video_frame_number = 0; + + video_enc = NULL; + audio_enc = NULL; + for(i=0;i<s->nb_streams;i++) { + enc = s->streams[i]->codec; + if (enc->codec_type == CODEC_TYPE_AUDIO) + audio_enc = enc; + else { + if ( enc->codec_id == CODEC_ID_VP6F || + enc->codec_id == CODEC_ID_FLV1 || + enc->codec_id == CODEC_ID_MJPEG ) { + video_enc = enc; + } else { + av_log(enc, AV_LOG_ERROR, "SWF only supports VP6, FLV1 and MJPEG\n"); + return -1; + } + } + } + + if (!video_enc) { + /* currenty, cannot work correctly if audio only */ + swf->video_type = 0; + width = 320; + height = 200; + rate = 10; + rate_base= 1; + } else { + swf->video_type = video_enc->codec_id; + width = video_enc->width; + height = video_enc->height; + rate = video_enc->time_base.den; + rate_base = video_enc->time_base.num; + } + + if (!audio_enc ) { + swf->audio_type = 0; + swf->samples_per_frame = ( 44100. * rate_base ) / rate; + } else { + swf->audio_type = audio_enc->codec_id; + swf->samples_per_frame = ( ( audio_enc->sample_rate ) * rate_base ) / rate; + } + + put_tag(pb, "FWS"); + if ( video_enc && video_enc->codec_id == CODEC_ID_VP6F ) { + put_byte(pb, 8); /* version (version 8 and above support VP6 codec) */ + } else if ( video_enc && video_enc->codec_id == CODEC_ID_FLV1 ) { + put_byte(pb, 6); /* version (version 6 and above support FLV1 codec) */ + } else { + put_byte(pb, 4); /* version (should use 4 for mpeg audio support) */ + } + put_le32(pb, DUMMY_FILE_SIZE); /* dummy size + (will be patched if not streamed) */ + + put_swf_rect(pb, 0, width * 20, 0, height * 20); + put_le16(pb, (rate * 256) / rate_base); /* frame rate */ + swf->duration_pos = url_ftell(pb); + put_le16(pb, (uint16_t)(DUMMY_DURATION * (int64_t)rate / rate_base)); /* frame count */ + + /* define a shape with the jpeg inside */ + if ( video_enc && (video_enc->codec_id == CODEC_ID_VP6F || + video_enc->codec_id == CODEC_ID_FLV1 )) { + } else if ( video_enc && video_enc->codec_id == CODEC_ID_MJPEG ) { + put_swf_tag(s, TAG_DEFINESHAPE); + + put_le16(pb, SHAPE_ID); /* ID of shape */ + /* bounding rectangle */ + put_swf_rect(pb, 0, width, 0, height); + /* style info */ + put_byte(pb, 1); /* one fill style */ + put_byte(pb, 0x41); /* clipped bitmap fill */ + put_le16(pb, BITMAP_ID); /* bitmap ID */ + /* position of the bitmap */ + put_swf_matrix(pb, (int)(1.0 * (1 << FRAC_BITS)), 0, + 0, (int)(1.0 * (1 << FRAC_BITS)), 0, 0); + put_byte(pb, 0); /* no line style */ + + /* shape drawing */ + init_put_bits(&p, buf1, sizeof(buf1)); + put_bits(&p, 4, 1); /* one fill bit */ + put_bits(&p, 4, 0); /* zero line bit */ + + put_bits(&p, 1, 0); /* not an edge */ + put_bits(&p, 5, FLAG_MOVETO | FLAG_SETFILL0); + put_bits(&p, 5, 1); /* nbits */ + put_bits(&p, 1, 0); /* X */ + put_bits(&p, 1, 0); /* Y */ + put_bits(&p, 1, 1); /* set fill style 1 */ + + /* draw the rectangle ! */ + put_swf_line_edge(&p, width, 0); + put_swf_line_edge(&p, 0, height); + put_swf_line_edge(&p, -width, 0); + put_swf_line_edge(&p, 0, -height); + + /* end of shape */ + put_bits(&p, 1, 0); /* not an edge */ + put_bits(&p, 5, 0); + + flush_put_bits(&p); + put_buffer(pb, buf1, pbBufPtr(&p) - p.buf); + + put_swf_end_tag(s); + } + + if (audio_enc && audio_enc->codec_id == CODEC_ID_MP3 ) { + int v; + + /* start sound */ + put_swf_tag(s, TAG_STREAMHEAD2); + + v = 0; + switch(audio_enc->sample_rate) { + case 11025: + v |= 1 << 2; + break; + case 22050: + v |= 2 << 2; + break; + case 44100: + v |= 3 << 2; + break; + default: + /* not supported */ + av_log(s, AV_LOG_ERROR, "swf doesnt support that sample rate, choose from (44100, 22050, 11025)\n"); + av_free(swf->audio_fifo); + av_free(swf); + return -1; + } + v |= 0x02; /* 16 bit playback */ + if (audio_enc->channels == 2) + v |= 0x01; /* stereo playback */ + put_byte(&s->pb, v); + v |= 0x20; /* mp3 compressed */ + put_byte(&s->pb, v); + put_le16(&s->pb, swf->samples_per_frame); /* avg samples per frame */ + put_le16(&s->pb, 0); + + put_swf_end_tag(s); + } + + put_flush_packet(&s->pb); + return 0; +} + +static int swf_write_video(AVFormatContext *s, + AVCodecContext *enc, const uint8_t *buf, int size) +{ + SWFContext *swf = s->priv_data; + ByteIOContext *pb = &s->pb; + int c = 0; + int outSize = 0; + int outSamples = 0; + + /* Flash Player limit */ + if ( swf->swf_frame_number == 16000 ) { + av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n"); + } + + if ( swf->audio_type ) { + /* Prescan audio data for this swf frame */ +retry_swf_audio_packet: + if ( ( swf->audio_size-outSize ) >= 4 ) { + int mp3FrameSize = 0; + int mp3SampleRate = 0; + int mp3IsMono = 0; + int mp3SamplesPerFrame = 0; + + /* copy out mp3 header from ring buffer */ + uint8_t header[4]; + for (c=0; c<4; c++) { + header[c] = swf->audio_fifo[(swf->audio_in_pos+outSize+c) % AUDIO_FIFO_SIZE]; + } + + if ( swf_mp3_info(header,&mp3FrameSize,&mp3SamplesPerFrame,&mp3SampleRate,&mp3IsMono) ) { + if ( ( swf->audio_size-outSize ) >= mp3FrameSize ) { + outSize += mp3FrameSize; + outSamples += mp3SamplesPerFrame; + if ( ( swf->sound_samples + outSamples + swf->samples_per_frame ) < swf->video_samples ) { + goto retry_swf_audio_packet; + } + } + } else { + /* invalid mp3 data, skip forward + we need to do this since the Flash Player + does not like custom headers */ + swf->audio_in_pos ++; + swf->audio_size --; + swf->audio_in_pos %= AUDIO_FIFO_SIZE; + goto retry_swf_audio_packet; + } + } + + /* audio stream is behind video stream, bail */ + if ( ( swf->sound_samples + outSamples + swf->samples_per_frame ) < swf->video_samples ) { + return 0; + } + } + + if ( swf->video_type == CODEC_ID_VP6F || + swf->video_type == CODEC_ID_FLV1 ) { + if ( swf->video_frame_number == 0 ) { + /* create a new video object */ + put_swf_tag(s, TAG_VIDEOSTREAM); + put_le16(pb, VIDEO_ID); + put_le16(pb, 15000 ); /* hard flash player limit */ + put_le16(pb, enc->width); + put_le16(pb, enc->height); + put_byte(pb, 0); + put_byte(pb,codec_get_tag(swf_codec_tags,swf->video_type)); + put_swf_end_tag(s); + + /* place the video object for the first time */ + put_swf_tag(s, TAG_PLACEOBJECT2); + put_byte(pb, 0x36); + put_le16(pb, 1); + put_le16(pb, VIDEO_ID); + put_swf_matrix(pb, 1 << FRAC_BITS, 0, 0, 1 << FRAC_BITS, 0, 0); + put_le16(pb, swf->video_frame_number ); + put_byte(pb, 'v'); + put_byte(pb, 'i'); + put_byte(pb, 'd'); + put_byte(pb, 'e'); + put_byte(pb, 'o'); + put_byte(pb, 0x00); + put_swf_end_tag(s); + } else { + /* mark the character for update */ + put_swf_tag(s, TAG_PLACEOBJECT2); + put_byte(pb, 0x11); + put_le16(pb, 1); + put_le16(pb, swf->video_frame_number ); + put_swf_end_tag(s); + } + + /* set video frame data */ + put_swf_tag(s, TAG_VIDEOFRAME | TAG_LONG); + put_le16(pb, VIDEO_ID); + put_le16(pb, swf->video_frame_number++ ); + put_buffer(pb, buf, size); + put_swf_end_tag(s); + } else if ( swf->video_type == CODEC_ID_MJPEG ) { + if (swf->swf_frame_number > 0) { + /* remove the shape */ + put_swf_tag(s, TAG_REMOVEOBJECT); + put_le16(pb, SHAPE_ID); /* shape ID */ + put_le16(pb, 1); /* depth */ + put_swf_end_tag(s); + + /* free the bitmap */ + put_swf_tag(s, TAG_FREECHARACTER); + put_le16(pb, BITMAP_ID); + put_swf_end_tag(s); + } + + put_swf_tag(s, TAG_JPEG2 | TAG_LONG); + + put_le16(pb, BITMAP_ID); /* ID of the image */ + + /* a dummy jpeg header seems to be required */ + put_byte(pb, 0xff); + put_byte(pb, 0xd8); + put_byte(pb, 0xff); + put_byte(pb, 0xd9); + /* write the jpeg image */ + put_buffer(pb, buf, size); + + put_swf_end_tag(s); + + /* draw the shape */ + + put_swf_tag(s, TAG_PLACEOBJECT); + put_le16(pb, SHAPE_ID); /* shape ID */ + put_le16(pb, 1); /* depth */ + put_swf_matrix(pb, 20 << FRAC_BITS, 0, 0, 20 << FRAC_BITS, 0, 0); + put_swf_end_tag(s); + } else { + /* invalid codec */ + } + + swf->swf_frame_number ++; + + swf->video_samples += swf->samples_per_frame; + + /* streaming sound always should be placed just before showframe tags */ + if ( outSize > 0 ) { + put_swf_tag(s, TAG_STREAMBLOCK | TAG_LONG); + put_le16(pb, outSamples); + put_le16(pb, 0); + for (c=0; c<outSize; c++) { + put_byte(pb,swf->audio_fifo[(swf->audio_in_pos+c) % AUDIO_FIFO_SIZE]); + } + put_swf_end_tag(s); + + /* update FIFO */ + swf->sound_samples += outSamples; + swf->audio_in_pos += outSize; + swf->audio_size -= outSize; + swf->audio_in_pos %= AUDIO_FIFO_SIZE; + } + + /* output the frame */ + put_swf_tag(s, TAG_SHOWFRAME); + put_swf_end_tag(s); + + put_flush_packet(&s->pb); + + return 0; +} + +static int swf_write_audio(AVFormatContext *s, + AVCodecContext *enc, const uint8_t *buf, int size) +{ + SWFContext *swf = s->priv_data; + int c = 0; + + /* Flash Player limit */ + if ( swf->swf_frame_number == 16000 ) { + av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n"); + } + + if (enc->codec_id == CODEC_ID_MP3 ) { + for (c=0; c<size; c++) { + swf->audio_fifo[(swf->audio_out_pos+c)%AUDIO_FIFO_SIZE] = buf[c]; + } + swf->audio_size += size; + swf->audio_out_pos += size; + swf->audio_out_pos %= AUDIO_FIFO_SIZE; + } + + /* if audio only stream make sure we add swf frames */ + if ( swf->video_type == 0 ) { + swf_write_video(s, enc, 0, 0); + } + + return 0; +} + +static int swf_write_packet(AVFormatContext *s, AVPacket *pkt) +{ + AVCodecContext *codec = s->streams[pkt->stream_index]->codec; + if (codec->codec_type == CODEC_TYPE_AUDIO) + return swf_write_audio(s, codec, pkt->data, pkt->size); + else + return swf_write_video(s, codec, pkt->data, pkt->size); +} + +static int swf_write_trailer(AVFormatContext *s) +{ + SWFContext *swf = s->priv_data; + ByteIOContext *pb = &s->pb; + AVCodecContext *enc, *video_enc; + int file_size, i; + + video_enc = NULL; + for(i=0;i<s->nb_streams;i++) { + enc = s->streams[i]->codec; + if (enc->codec_type == CODEC_TYPE_VIDEO) + video_enc = enc; + } + + put_swf_tag(s, TAG_END); + put_swf_end_tag(s); + + put_flush_packet(&s->pb); + + /* patch file size and number of frames if not streamed */ + if (!url_is_streamed(&s->pb) && video_enc) { + file_size = url_ftell(pb); + url_fseek(pb, 4, SEEK_SET); + put_le32(pb, file_size); + url_fseek(pb, swf->duration_pos, SEEK_SET); + put_le16(pb, video_enc->frame_number); + } + + av_free(swf->audio_fifo); + + return 0; +} +#endif //CONFIG_MUXERS + +/*********************************************/ +/* Extract FLV encoded frame and MP3 from swf + Note that the detection of the real frame + is inaccurate at this point as it can be + quite tricky to determine, you almost certainly + will get a bad audio/video sync */ + +static int get_swf_tag(ByteIOContext *pb, int *len_ptr) +{ + int tag, len; + + if (url_feof(pb)) + return -1; + + tag = get_le16(pb); + len = tag & 0x3f; + tag = tag >> 6; + if (len == 0x3f) { + len = get_le32(pb); + } +// av_log(NULL, AV_LOG_DEBUG, "Tag: %d - Len: %d\n", tag, len); + *len_ptr = len; + return tag; +} + + +static int swf_probe(AVProbeData *p) +{ + /* check file header */ + if (p->buf_size <= 16) + return 0; + if ((p->buf[0] == 'F' || p->buf[0] == 'C') && p->buf[1] == 'W' && + p->buf[2] == 'S') + return AVPROBE_SCORE_MAX; + else + return 0; +} + +static int swf_read_header(AVFormatContext *s, AVFormatParameters *ap) +{ + SWFContext *swf = 0; + ByteIOContext *pb = &s->pb; + int nbits, len, frame_rate, tag, v; + offset_t firstTagOff; + AVStream *ast = 0; + AVStream *vst = 0; + + swf = av_malloc(sizeof(SWFContext)); + if (!swf) + return -1; + s->priv_data = swf; + + tag = get_be32(pb) & 0xffffff00; + + if (tag == MKBETAG('C', 'W', 'S', 0)) + { + av_log(s, AV_LOG_ERROR, "Compressed SWF format not supported\n"); + return AVERROR_IO; + } + if (tag != MKBETAG('F', 'W', 'S', 0)) + return AVERROR_IO; + get_le32(pb); + /* skip rectangle size */ + nbits = get_byte(pb) >> 3; + len = (4 * nbits - 3 + 7) / 8; + url_fskip(pb, len); + frame_rate = get_le16(pb); + get_le16(pb); /* frame count */ + + /* The Flash Player converts 8.8 frame rates + to milliseconds internally. Do the same to get + a correct framerate */ + swf->ms_per_frame = ( 1000 * 256 ) / frame_rate; + swf->samples_per_frame = 0; + swf->ch_id = -1; + + firstTagOff = url_ftell(pb); + for(;;) { + tag = get_swf_tag(pb, &len); + if (tag < 0) { + if ( ast || vst ) { + if ( vst && ast ) { + vst->codec->time_base.den = ast->codec->sample_rate / swf->samples_per_frame; + vst->codec->time_base.num = 1; + } + break; + } + av_log(s, AV_LOG_ERROR, "No media found in SWF\n"); + return AVERROR_IO; + } + if ( tag == TAG_VIDEOSTREAM && !vst) { + int codec_id; + swf->ch_id = get_le16(pb); + get_le16(pb); + get_le16(pb); + get_le16(pb); + get_byte(pb); + /* Check for FLV1 */ + codec_id = codec_get_id(swf_codec_tags, get_byte(pb)); + if ( codec_id ) { + vst = av_new_stream(s, 0); + av_set_pts_info(vst, 24, 1, 1000); /* 24 bit pts in ms */ + + vst->codec->codec_type = CODEC_TYPE_VIDEO; + vst->codec->codec_id = codec_id; + if ( swf->samples_per_frame ) { + vst->codec->time_base.den = 1000. / swf->ms_per_frame; + vst->codec->time_base.num = 1; + } + } + } else if ( ( tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2 ) && !ast) { + /* streaming found */ + get_byte(pb); + v = get_byte(pb); + swf->samples_per_frame = get_le16(pb); + if (len!=4) + url_fskip(pb,len-4); + /* if mp3 streaming found, OK */ + if ((v & 0x20) != 0) { + if ( tag == TAG_STREAMHEAD2 ) { + get_le16(pb); + } + ast = av_new_stream(s, 1); + if (!ast) + return -ENOMEM; + av_set_pts_info(ast, 24, 1, 1000); /* 24 bit pts in ms */ + + if (v & 0x01) + ast->codec->channels = 2; + else + ast->codec->channels = 1; + + switch((v>> 2) & 0x03) { + case 1: + ast->codec->sample_rate = 11025; + break; + case 2: + ast->codec->sample_rate = 22050; + break; + case 3: + ast->codec->sample_rate = 44100; + break; + default: + av_free(ast); + return AVERROR_IO; + } + ast->codec->codec_type = CODEC_TYPE_AUDIO; + ast->codec->codec_id = CODEC_ID_MP3; + ast->need_parsing = 1; + } + } else { + url_fskip(pb, len); + } + } + url_fseek(pb, firstTagOff, SEEK_SET); + + return 0; +} + +static int swf_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + SWFContext *swf = s->priv_data; + ByteIOContext *pb = &s->pb; + AVStream *st = 0; + int tag, len, i, frame; + + for(;;) { + tag = get_swf_tag(pb, &len); + if (tag < 0) + return AVERROR_IO; + if (tag == TAG_VIDEOFRAME) { + for( i=0; i<s->nb_streams; i++ ) { + st = s->streams[i]; + if (st->id == 0) { + if ( get_le16(pb) == swf->ch_id ) { + frame = get_le16(pb); + av_get_packet(pb, pkt, len-4); + pkt->pts = frame * swf->ms_per_frame; + pkt->stream_index = st->index; + return pkt->size; + } else { + url_fskip(pb, len-2); + continue; + } + } + } + url_fskip(pb, len); + } else if (tag == TAG_STREAMBLOCK) { + for( i=0; i<s->nb_streams; i++ ) { + st = s->streams[i]; + if (st->id == 1) { + url_fskip(pb, 4); + av_get_packet(pb, pkt, len-4); + pkt->stream_index = st->index; + return pkt->size; + } + } + url_fskip(pb, len); + } else { + url_fskip(pb, len); + } + } + return 0; +} + +static int swf_read_close(AVFormatContext *s) +{ + return 0; +} + +#ifdef CONFIG_SWF_DEMUXER +AVInputFormat swf_demuxer = { + "swf", + "Flash format", + sizeof(SWFContext), + swf_probe, + swf_read_header, + swf_read_packet, + swf_read_close, +}; +#endif +#ifdef CONFIG_SWF_MUXER +AVOutputFormat swf_muxer = { + "swf", + "Flash format", + "application/x-shockwave-flash", + "swf", + sizeof(SWFContext), + CODEC_ID_MP3, + CODEC_ID_FLV1, + swf_write_header, + swf_write_packet, + swf_write_trailer, +}; +#endif |