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/* |
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* Copyright (c) 2013-2014 Mozilla Corporation |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* Opus parser |
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* |
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* Determines the duration for each packet. |
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*/ |
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#include "avcodec.h" |
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#include "bytestream.h" |
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#include "opus.h" |
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#include "parser.h" |
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typedef struct OpusParseContext { |
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ParseContext pc; |
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OpusContext ctx; |
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OpusPacket pkt; |
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int extradata_parsed; |
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int ts_framing; |
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} OpusParseContext; |
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static const uint8_t *parse_opus_ts_header(const uint8_t *start, int *payload_len, int buf_len) |
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{ |
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const uint8_t *buf = start + 1; |
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int start_trim_flag, end_trim_flag, control_extension_flag, control_extension_length; |
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uint8_t flags; |
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uint64_t payload_len_tmp; |
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GetByteContext gb; |
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bytestream2_init(&gb, buf, buf_len); |
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flags = bytestream2_get_byte(&gb); |
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start_trim_flag = (flags >> 4) & 1; |
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end_trim_flag = (flags >> 3) & 1; |
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control_extension_flag = (flags >> 2) & 1; |
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payload_len_tmp = *payload_len = 0; |
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✓✓ |
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while (bytestream2_peek_byte(&gb) == 0xff) |
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payload_len_tmp += bytestream2_get_byte(&gb); |
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payload_len_tmp += bytestream2_get_byte(&gb); |
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✗✓ |
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if (start_trim_flag) |
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bytestream2_skip(&gb, 2); |
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✗✓ |
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if (end_trim_flag) |
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bytestream2_skip(&gb, 2); |
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✗✓ |
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if (control_extension_flag) { |
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control_extension_length = bytestream2_get_byte(&gb); |
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bytestream2_skip(&gb, control_extension_length); |
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} |
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✗✓ |
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if (bytestream2_tell(&gb) + payload_len_tmp > buf_len) |
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return NULL; |
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*payload_len = payload_len_tmp; |
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return buf + bytestream2_tell(&gb); |
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} |
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/** |
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* Find the end of the current frame in the bitstream. |
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* @return the position of the first byte of the next frame, or -1 |
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*/ |
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static int opus_find_frame_end(AVCodecParserContext *ctx, AVCodecContext *avctx, |
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const uint8_t *buf, int buf_size, int *header_len) |
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{ |
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OpusParseContext *s = ctx->priv_data; |
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ParseContext *pc = &s->pc; |
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int ret, start_found, i = 0, payload_len = 0; |
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const uint8_t *payload; |
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uint32_t state; |
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uint16_t hdr; |
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*header_len = 0; |
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✓✓ |
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if (!buf_size) |
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return 0; |
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start_found = pc->frame_start_found; |
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state = pc->state; |
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payload = buf; |
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/* Check if we're using Opus in MPEG-TS framing */ |
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✓✓✓✗
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if (!s->ts_framing && buf_size > 2) { |
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hdr = AV_RB16(buf); |
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✓✓ |
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if ((hdr & OPUS_TS_MASK) == OPUS_TS_HEADER) |
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s->ts_framing = 1; |
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} |
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✓✓✓✗
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if (s->ts_framing && !start_found) { |
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✓✗ |
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for (i = 0; i < buf_size-2; i++) { |
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state = (state << 8) | payload[i]; |
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✓✓ |
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if ((state & OPUS_TS_MASK) == OPUS_TS_HEADER) { |
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payload = parse_opus_ts_header(payload, &payload_len, buf_size - i); |
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✗✓ |
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if (!payload) { |
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av_log(avctx, AV_LOG_ERROR, "Error parsing Ogg TS header.\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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*header_len = payload - buf; |
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start_found = 1; |
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break; |
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} |
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} |
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} |
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✓✓ |
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if (!s->ts_framing) |
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payload_len = buf_size; |
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✓✗✓✓
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if (avctx->extradata && !s->extradata_parsed) { |
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ret = ff_opus_parse_extradata(avctx, &s->ctx); |
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✗✓ |
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if (ret < 0) { |
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av_log(avctx, AV_LOG_ERROR, "Error parsing Ogg extradata.\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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av_freep(&s->ctx.channel_maps); |
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s->extradata_parsed = 1; |
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} |
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✓✗✓✓ ✓✗ |
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if (payload_len <= buf_size && (!s->ts_framing || start_found)) { |
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ret = ff_opus_parse_packet(&s->pkt, payload, payload_len, s->ctx.nb_streams > 1); |
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✗✓ |
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if (ret < 0) { |
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av_log(avctx, AV_LOG_ERROR, "Error parsing Opus packet header.\n"); |
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pc->frame_start_found = 0; |
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return AVERROR_INVALIDDATA; |
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} |
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ctx->duration = s->pkt.frame_count * s->pkt.frame_duration; |
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} |
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✓✓ |
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if (s->ts_framing) { |
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✓✗ |
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if (start_found) { |
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✓✗ |
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if (payload_len + *header_len <= buf_size) { |
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pc->frame_start_found = 0; |
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pc->state = -1; |
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return payload_len + *header_len; |
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} |
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} |
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pc->frame_start_found = start_found; |
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pc->state = state; |
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return END_NOT_FOUND; |
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} |
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return buf_size; |
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} |
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static int opus_parse(AVCodecParserContext *ctx, AVCodecContext *avctx, |
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const uint8_t **poutbuf, int *poutbuf_size, |
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const uint8_t *buf, int buf_size) |
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{ |
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OpusParseContext *s = ctx->priv_data; |
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ParseContext *pc = &s->pc; |
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int next, header_len; |
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next = opus_find_frame_end(ctx, avctx, buf, buf_size, &header_len); |
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✓✓✓✗ ✗✓ |
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if (s->ts_framing && next != AVERROR_INVALIDDATA && |
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ff_combine_frame(pc, next, &buf, &buf_size) < 0) { |
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*poutbuf = NULL; |
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*poutbuf_size = 0; |
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return buf_size; |
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} |
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✗✓ |
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if (next == AVERROR_INVALIDDATA){ |
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*poutbuf = NULL; |
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*poutbuf_size = 0; |
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return buf_size; |
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} |
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*poutbuf = buf + header_len; |
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*poutbuf_size = buf_size - header_len; |
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return next; |
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} |
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AVCodecParser ff_opus_parser = { |
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.codec_ids = { AV_CODEC_ID_OPUS }, |
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.priv_data_size = sizeof(OpusParseContext), |
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.parser_parse = opus_parse, |
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.parser_close = ff_parse_close |
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}; |