static int wc3_read_packet(AVFormatContext *s, AVPacket *pkt) { Wc3DemuxContext *wc3 = s->priv_data; ByteIOContext *pb = s->pb; unsigned int fourcc_tag; unsigned int size; int packet_read = 0; int ret = 0; unsigned char preamble[WC3_PREAMBLE_SIZE]; unsigned char text[1024]; unsigned int palette_number; int i; unsigned char r, g, b; int base_palette_index; while (!packet_read) { /* get the next chunk preamble */ if ((ret = get_buffer(pb, preamble, WC3_PREAMBLE_SIZE)) != WC3_PREAMBLE_SIZE) ret = AVERROR(EIO); fourcc_tag = AV_RL32(&preamble[0]); /* chunk sizes are 16-bit aligned */ size = (AV_RB32(&preamble[4]) + 1) & (~1); switch (fourcc_tag) { case BRCH_TAG: /* no-op */ break; case SHOT_TAG: /* load up new palette */ if ((ret = get_buffer(pb, preamble, 4)) != 4) return AVERROR(EIO); palette_number = AV_RL32(&preamble[0]); if (palette_number >= wc3->palette_count) return AVERROR_INVALIDDATA; base_palette_index = palette_number * PALETTE_COUNT * 3; for (i = 0; i < PALETTE_COUNT; i++) { r = wc3->palettes[base_palette_index + i * 3 + 0]; g = wc3->palettes[base_palette_index + i * 3 + 1]; b = wc3->palettes[base_palette_index + i * 3 + 2]; wc3->palette_control.palette[i] = (r << 16) | (g << 8) | (b); } wc3->palette_control.palette_changed = 1; break; case VGA__TAG: /* send out video chunk */ ret= av_get_packet(pb, pkt, size); pkt->stream_index = wc3->video_stream_index; pkt->pts = wc3->pts; if (ret != size) ret = AVERROR(EIO); packet_read = 1; break; case TEXT_TAG: /* subtitle chunk */ #if 0 url_fseek(pb, size, SEEK_CUR); #else if ((unsigned)size > sizeof(text) || (ret = get_buffer(pb, text, size)) != size) ret = AVERROR(EIO); else { int i = 0; av_log (s, AV_LOG_DEBUG, "Subtitle time!\n"); av_log (s, AV_LOG_DEBUG, " inglish: %s\n", &text[i + 1]); i += text[i] + 1; av_log (s, AV_LOG_DEBUG, " doytsch: %s\n", &text[i + 1]); i += text[i] + 1; av_log (s, AV_LOG_DEBUG, " fronsay: %s\n", &text[i + 1]); } #endif break; case AUDI_TAG: /* send out audio chunk */ ret= av_get_packet(pb, pkt, size); pkt->stream_index = wc3->audio_stream_index; pkt->pts = wc3->pts; if (ret != size) ret = AVERROR(EIO); /* time to advance pts */ wc3->pts++; packet_read = 1; break; default: av_log (s, AV_LOG_ERROR, " unrecognized WC3 chunk: %c%c%c%c (0x%02X%02X%02X%02X)\n", preamble[0], preamble[1], preamble[2], preamble[3], preamble[0], preamble[1], preamble[2], preamble[3]); ret = AVERROR_INVALIDDATA; packet_read = 1; break; } } return ret; }
static int wc3_read_packet(AVFormatContext *s, AVPacket *pkt) { Wc3DemuxContext *wc3 = s->priv_data; ByteIOContext *pb = s->pb; unsigned int fourcc_tag; unsigned int size; int packet_read = 0; int ret = 0; unsigned char preamble[WC3_PREAMBLE_SIZE]; unsigned char text[1024]; unsigned int palette_number; int i; unsigned char r, g, b; int base_palette_index; while (!packet_read) {   if ((ret = get_buffer(pb, preamble, WC3_PREAMBLE_SIZE)) != WC3_PREAMBLE_SIZE) ret = AVERROR(EIO); fourcc_tag = AV_RL32(&preamble[0]);   size = (AV_RB32(&preamble[4]) + 1) & (~1); switch (fourcc_tag) { case BRCH_TAG:   break; case SHOT_TAG:   if ((ret = get_buffer(pb, preamble, 4)) != 4) return AVERROR(EIO); palette_number = AV_RL32(&preamble[0]); if (palette_number >= wc3->palette_count) return AVERROR_INVALIDDATA; base_palette_index = palette_number * PALETTE_COUNT * 3; for (i = 0; i < PALETTE_COUNT; i++) { r = wc3->palettes[base_palette_index + i * 3 + 0]; g = wc3->palettes[base_palette_index + i * 3 + 1]; b = wc3->palettes[base_palette_index + i * 3 + 2]; wc3->palette_control.palette[i] = (r << 16) | (g << 8) | (b); } wc3->palette_control.palette_changed = 1; break; case VGA__TAG:   ret= av_get_packet(pb, pkt, size); pkt->stream_index = wc3->video_stream_index; pkt->pts = wc3->pts; if (ret != size) ret = AVERROR(EIO); packet_read = 1; break; case TEXT_TAG:   #if 0 url_fseek(pb, size, SEEK_CUR); #else if ((unsigned)size > sizeof(text) || (ret = get_buffer(pb, text, size)) != size) ret = AVERROR(EIO); else { int i = 0; av_log (s, AV_LOG_DEBUG, "Subtitle time!\n"); av_log (s, AV_LOG_DEBUG, " inglish: %s\n", &text[i + 1]); i += text[i] + 1; av_log (s, AV_LOG_DEBUG, " doytsch: %s\n", &text[i + 1]); i += text[i] + 1; av_log (s, AV_LOG_DEBUG, " fronsay: %s\n", &text[i + 1]); } #endif break; case AUDI_TAG:   ret= av_get_packet(pb, pkt, size); pkt->stream_index = wc3->audio_stream_index; pkt->pts = wc3->pts; if (ret != size) ret = AVERROR(EIO);   wc3->pts++; packet_read = 1; break; default: av_log (s, AV_LOG_ERROR, " unrecognized WC3 chunk: %c%c%c%c (0x%02X%02X%02X%02X)\n", preamble[0], preamble[1], preamble[2], preamble[3], preamble[0], preamble[1], preamble[2], preamble[3]); ret = AVERROR_INVALIDDATA; packet_read = 1; break; } } return ret; }