deleted file mode 100644
--- a/media/ffvpx/libavcodec/flac_parser.c
+++ /dev/null
@@ -1,757 +0,0 @@
-/*
- * FLAC parser
- * Copyright (c) 2010 Michael Chinen
- *
- * 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
- */
-
-/**
- * @file
- * FLAC parser
- *
- * The FLAC parser buffers input until FLAC_MIN_HEADERS has been found.
- * Each time it finds and verifies a CRC-8 header it sees which of the
- * FLAC_MAX_SEQUENTIAL_HEADERS that came before it have a valid CRC-16 footer
- * that ends at the newly found header.
- * Headers are scored by FLAC_HEADER_BASE_SCORE plus the max of its crc-verified
- * children, penalized by changes in sample rate, frame number, etc.
- * The parser returns the frame with the highest score.
- **/
-
-#include "libavutil/attributes.h"
-#include "libavutil/crc.h"
-#include "libavutil/fifo.h"
-#include "bytestream.h"
-#include "parser.h"
-#include "flac.h"
-
-/** maximum number of adjacent headers that compare CRCs against each other */
-#define FLAC_MAX_SEQUENTIAL_HEADERS 4
-/** minimum number of headers buffered and checked before returning frames */
-#define FLAC_MIN_HEADERS 10
-/** estimate for average size of a FLAC frame */
-#define FLAC_AVG_FRAME_SIZE 8192
-
-/** scoring settings for score_header */
-#define FLAC_HEADER_BASE_SCORE 10
-#define FLAC_HEADER_CHANGED_PENALTY 7
-#define FLAC_HEADER_CRC_FAIL_PENALTY 50
-#define FLAC_HEADER_NOT_PENALIZED_YET 100000
-#define FLAC_HEADER_NOT_SCORED_YET -100000
-
-/** largest possible size of flac header */
-#define MAX_FRAME_HEADER_SIZE 16
-
-typedef struct FLACHeaderMarker {
- int offset; /**< byte offset from start of FLACParseContext->buffer */
- int *link_penalty; /**< pointer to array of local scores between this header
- and the one at a distance equal array position */
- int max_score; /**< maximum score found after checking each child that
- has a valid CRC */
- FLACFrameInfo fi; /**< decoded frame header info */
- struct FLACHeaderMarker *next; /**< next CRC-8 verified header that
- immediately follows this one in
- the bytestream */
- struct FLACHeaderMarker *best_child; /**< following frame header with
- which this frame has the best
- score with */
-} FLACHeaderMarker;
-
-typedef struct FLACParseContext {
- AVCodecParserContext *pc; /**< parent context */
- AVCodecContext *avctx; /**< codec context pointer for logging */
- FLACHeaderMarker *headers; /**< linked-list that starts at the first
- CRC-8 verified header within buffer */
- FLACHeaderMarker *best_header; /**< highest scoring header within buffer */
- int nb_headers_found; /**< number of headers found in the last
- flac_parse() call */
- int nb_headers_buffered; /**< number of headers that are buffered */
- int best_header_valid; /**< flag set when the parser returns junk;
- if set return best_header next time */
- AVFifoBuffer *fifo_buf; /**< buffer to store all data until headers
- can be verified */
- int end_padded; /**< specifies if fifo_buf's end is padded */
- uint8_t *wrap_buf; /**< general fifo read buffer when wrapped */
- int wrap_buf_allocated_size; /**< actual allocated size of the buffer */
- FLACFrameInfo last_fi; /**< last decoded frame header info */
- int last_fi_valid; /**< set if last_fi is valid */
-} FLACParseContext;
-
-static int frame_header_is_valid(AVCodecContext *avctx, const uint8_t *buf,
- FLACFrameInfo *fi)
-{
- GetBitContext gb;
- init_get_bits(&gb, buf, MAX_FRAME_HEADER_SIZE * 8);
- return !ff_flac_decode_frame_header(avctx, &gb, fi, 127);
-}
-
-/**
- * Non-destructive fast fifo pointer fetching
- * Returns a pointer from the specified offset.
- * If possible the pointer points within the fifo buffer.
- * Otherwise (if it would cause a wrap around,) a pointer to a user-specified
- * buffer is used.
- * The pointer can be NULL. In any case it will be reallocated to hold the size.
- * If the returned pointer will be used after subsequent calls to flac_fifo_read_wrap
- * then the subsequent calls should pass in a different wrap_buf so as to not
- * overwrite the contents of the previous wrap_buf.
- * This function is based on av_fifo_generic_read, which is why there is a comment
- * about a memory barrier for SMP.
- */
-static uint8_t* flac_fifo_read_wrap(FLACParseContext *fpc, int offset, int len,
- uint8_t** wrap_buf, int* allocated_size)
-{
- AVFifoBuffer *f = fpc->fifo_buf;
- uint8_t *start = f->rptr + offset;
- uint8_t *tmp_buf;
-
- if (start >= f->end)
- start -= f->end - f->buffer;
- if (f->end - start >= len)
- return start;
-
- tmp_buf = av_fast_realloc(*wrap_buf, allocated_size, len);
-
- if (!tmp_buf) {
- av_log(fpc->avctx, AV_LOG_ERROR,
- "couldn't reallocate wrap buffer of size %d", len);
- return NULL;
- }
- *wrap_buf = tmp_buf;
- do {
- int seg_len = FFMIN(f->end - start, len);
- memcpy(tmp_buf, start, seg_len);
- tmp_buf = (uint8_t*)tmp_buf + seg_len;
-// memory barrier needed for SMP here in theory
-
- start += seg_len - (f->end - f->buffer);
- len -= seg_len;
- } while (len > 0);
-
- return *wrap_buf;
-}
-
-/**
- * Return a pointer in the fifo buffer where the offset starts at until
- * the wrap point or end of request.
- * len will contain the valid length of the returned buffer.
- * A second call to flac_fifo_read (with new offset and len) should be called
- * to get the post-wrap buf if the returned len is less than the requested.
- **/
-static uint8_t* flac_fifo_read(FLACParseContext *fpc, int offset, int *len)
-{
- AVFifoBuffer *f = fpc->fifo_buf;
- uint8_t *start = f->rptr + offset;
-
- if (start >= f->end)
- start -= f->end - f->buffer;
- *len = FFMIN(*len, f->end - start);
- return start;
-}
-
-static int find_headers_search_validate(FLACParseContext *fpc, int offset)
-{
- FLACFrameInfo fi;
- uint8_t *header_buf;
- int size = 0;
- header_buf = flac_fifo_read_wrap(fpc, offset,
- MAX_FRAME_HEADER_SIZE,
- &fpc->wrap_buf,
- &fpc->wrap_buf_allocated_size);
- if (frame_header_is_valid(fpc->avctx, header_buf, &fi)) {
- FLACHeaderMarker **end_handle = &fpc->headers;
- int i;
-
- size = 0;
- while (*end_handle) {
- end_handle = &(*end_handle)->next;
- size++;
- }
-
- *end_handle = av_mallocz(sizeof(**end_handle));
- if (!*end_handle) {
- av_log(fpc->avctx, AV_LOG_ERROR,
- "couldn't allocate FLACHeaderMarker\n");
- return AVERROR(ENOMEM);
- }
- (*end_handle)->fi = fi;
- (*end_handle)->offset = offset;
- (*end_handle)->link_penalty = av_malloc(sizeof(int) *
- FLAC_MAX_SEQUENTIAL_HEADERS);
- if (!(*end_handle)->link_penalty) {
- av_freep(end_handle);
- av_log(fpc->avctx, AV_LOG_ERROR,
- "couldn't allocate link_penalty\n");
- return AVERROR(ENOMEM);
- }
-
- for (i = 0; i < FLAC_MAX_SEQUENTIAL_HEADERS; i++)
- (*end_handle)->link_penalty[i] = FLAC_HEADER_NOT_PENALIZED_YET;
-
- fpc->nb_headers_found++;
- size++;
- }
- return size;
-}
-
-static int find_headers_search(FLACParseContext *fpc, uint8_t *buf, int buf_size,
- int search_start)
-
-{
- int size = 0, mod_offset = (buf_size - 1) % 4, i, j;
- uint32_t x;
-
- for (i = 0; i < mod_offset; i++) {
- if ((AV_RB16(buf + i) & 0xFFFE) == 0xFFF8)
- size = find_headers_search_validate(fpc, search_start + i);
- }
-
- for (; i < buf_size - 1; i += 4) {
- x = AV_RB32(buf + i);
- if (((x & ~(x + 0x01010101)) & 0x80808080)) {
- for (j = 0; j < 4; j++) {
- if ((AV_RB16(buf + i + j) & 0xFFFE) == 0xFFF8)
- size = find_headers_search_validate(fpc, search_start + i + j);
- }
- }
- }
- return size;
-}
-
-static int find_new_headers(FLACParseContext *fpc, int search_start)
-{
- FLACHeaderMarker *end;
- int search_end, size = 0, read_len, temp;
- uint8_t *buf;
- fpc->nb_headers_found = 0;
-
- /* Search for a new header of at most 16 bytes. */
- search_end = av_fifo_size(fpc->fifo_buf) - (MAX_FRAME_HEADER_SIZE - 1);
- read_len = search_end - search_start + 1;
- buf = flac_fifo_read(fpc, search_start, &read_len);
- size = find_headers_search(fpc, buf, read_len, search_start);
- search_start += read_len - 1;
-
- /* If fifo end was hit do the wrap around. */
- if (search_start != search_end) {
- uint8_t wrap[2];
-
- wrap[0] = buf[read_len - 1];
- read_len = search_end - search_start + 1;
-
- /* search_start + 1 is the post-wrap offset in the fifo. */
- buf = flac_fifo_read(fpc, search_start + 1, &read_len);
- wrap[1] = buf[0];
-
- if ((AV_RB16(wrap) & 0xFFFE) == 0xFFF8) {
- temp = find_headers_search_validate(fpc, search_start);
- size = FFMAX(size, temp);
- }
- search_start++;
-
- /* Continue to do the last half of the wrap. */
- temp = find_headers_search(fpc, buf, read_len, search_start);
- size = FFMAX(size, temp);
- search_start += read_len - 1;
- }
-
- /* Return the size even if no new headers were found. */
- if (!size && fpc->headers)
- for (end = fpc->headers; end; end = end->next)
- size++;
- return size;
-}
-
-static int check_header_fi_mismatch(FLACParseContext *fpc,
- FLACFrameInfo *header_fi,
- FLACFrameInfo *child_fi,
- int log_level_offset)
-{
- int deduction = 0;
- if (child_fi->samplerate != header_fi->samplerate) {
- deduction += FLAC_HEADER_CHANGED_PENALTY;
- av_log(fpc->avctx, AV_LOG_WARNING + log_level_offset,
- "sample rate change detected in adjacent frames\n");
- }
- if (child_fi->bps != header_fi->bps) {
- deduction += FLAC_HEADER_CHANGED_PENALTY;
- av_log(fpc->avctx, AV_LOG_WARNING + log_level_offset,
- "bits per sample change detected in adjacent frames\n");
- }
- if (child_fi->is_var_size != header_fi->is_var_size) {
- /* Changing blocking strategy not allowed per the spec */
- deduction += FLAC_HEADER_BASE_SCORE;
- av_log(fpc->avctx, AV_LOG_WARNING + log_level_offset,
- "blocking strategy change detected in adjacent frames\n");
- }
- if (child_fi->channels != header_fi->channels) {
- deduction += FLAC_HEADER_CHANGED_PENALTY;
- av_log(fpc->avctx, AV_LOG_WARNING + log_level_offset,
- "number of channels change detected in adjacent frames\n");
- }
- return deduction;
-}
-
-static int check_header_mismatch(FLACParseContext *fpc,
- FLACHeaderMarker *header,
- FLACHeaderMarker *child,
- int log_level_offset)
-{
- FLACFrameInfo *header_fi = &header->fi, *child_fi = &child->fi;
- int deduction, deduction_expected = 0, i;
- deduction = check_header_fi_mismatch(fpc, header_fi, child_fi,
- log_level_offset);
- /* Check sample and frame numbers. */
- if ((child_fi->frame_or_sample_num - header_fi->frame_or_sample_num
- != header_fi->blocksize) &&
- (child_fi->frame_or_sample_num
- != header_fi->frame_or_sample_num + 1)) {
- FLACHeaderMarker *curr;
- int expected_frame_num, expected_sample_num;
- /* If there are frames in the middle we expect this deduction,
- as they are probably valid and this one follows it */
-
- expected_frame_num = expected_sample_num = header_fi->frame_or_sample_num;
- curr = header;
- while (curr != child) {
- /* Ignore frames that failed all crc checks */
- for (i = 0; i < FLAC_MAX_SEQUENTIAL_HEADERS; i++) {
- if (curr->link_penalty[i] < FLAC_HEADER_CRC_FAIL_PENALTY) {
- expected_frame_num++;
- expected_sample_num += curr->fi.blocksize;
- break;
- }
- }
- curr = curr->next;
- }
-
- if (expected_frame_num == child_fi->frame_or_sample_num ||
- expected_sample_num == child_fi->frame_or_sample_num)
- deduction_expected = deduction ? 0 : 1;
-
- deduction += FLAC_HEADER_CHANGED_PENALTY;
- av_log(fpc->avctx, AV_LOG_WARNING + log_level_offset,
- "sample/frame number mismatch in adjacent frames\n");
- }
-
- /* If we have suspicious headers, check the CRC between them */
- if (deduction && !deduction_expected) {
- FLACHeaderMarker *curr;
- int read_len;
- uint8_t *buf;
- uint32_t crc = 1;
- int inverted_test = 0;
-
- /* Since CRC is expensive only do it if we haven't yet.
- This assumes a CRC penalty is greater than all other check penalties */
- curr = header->next;
- for (i = 0; i < FLAC_MAX_SEQUENTIAL_HEADERS && curr != child; i++)
- curr = curr->next;
-
- if (header->link_penalty[i] < FLAC_HEADER_CRC_FAIL_PENALTY ||
- header->link_penalty[i] == FLAC_HEADER_NOT_PENALIZED_YET) {
- FLACHeaderMarker *start, *end;
-
- /* Although overlapping chains are scored, the crc should never
- have to be computed twice for a single byte. */
- start = header;
- end = child;
- if (i > 0 &&
- header->link_penalty[i - 1] >= FLAC_HEADER_CRC_FAIL_PENALTY) {
- while (start->next != child)
- start = start->next;
- inverted_test = 1;
- } else if (i > 0 &&
- header->next->link_penalty[i-1] >=
- FLAC_HEADER_CRC_FAIL_PENALTY ) {
- end = header->next;
- inverted_test = 1;
- }
-
- read_len = end->offset - start->offset;
- buf = flac_fifo_read(fpc, start->offset, &read_len);
- crc = av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, buf, read_len);
- read_len = (end->offset - start->offset) - read_len;
-
- if (read_len) {
- buf = flac_fifo_read(fpc, end->offset - read_len, &read_len);
- crc = av_crc(av_crc_get_table(AV_CRC_16_ANSI), crc, buf, read_len);
- }
- }
-
- if (!crc ^ !inverted_test) {
- deduction += FLAC_HEADER_CRC_FAIL_PENALTY;
- av_log(fpc->avctx, AV_LOG_WARNING + log_level_offset,
- "crc check failed from offset %i (frame %"PRId64") to %i (frame %"PRId64")\n",
- header->offset, header_fi->frame_or_sample_num,
- child->offset, child_fi->frame_or_sample_num);
- }
- }
- return deduction;
-}
-
-/**
- * Score a header.
- *
- * Give FLAC_HEADER_BASE_SCORE points to a frame for existing.
- * If it has children, (subsequent frames of which the preceding CRC footer
- * validates against this one,) then take the maximum score of the children,
- * with a penalty of FLAC_HEADER_CHANGED_PENALTY applied for each change to
- * bps, sample rate, channels, but not decorrelation mode, or blocksize,
- * because it can change often.
- **/
-static int score_header(FLACParseContext *fpc, FLACHeaderMarker *header)
-{
- FLACHeaderMarker *child;
- int dist = 0;
- int child_score;
- int base_score = FLAC_HEADER_BASE_SCORE;
- if (header->max_score != FLAC_HEADER_NOT_SCORED_YET)
- return header->max_score;
-
- /* Modify the base score with changes from the last output header */
- if (fpc->last_fi_valid) {
- /* Silence the log since this will be repeated if selected */
- base_score -= check_header_fi_mismatch(fpc, &fpc->last_fi, &header->fi,
- AV_LOG_DEBUG);
- }
-
- header->max_score = base_score;
-
- /* Check and compute the children's scores. */
- child = header->next;
- for (dist = 0; dist < FLAC_MAX_SEQUENTIAL_HEADERS && child; dist++) {
- /* Look at the child's frame header info and penalize suspicious
- changes between the headers. */
- if (header->link_penalty[dist] == FLAC_HEADER_NOT_PENALIZED_YET) {
- header->link_penalty[dist] = check_header_mismatch(fpc, header,
- child, AV_LOG_DEBUG);
- }
- child_score = score_header(fpc, child) - header->link_penalty[dist];
-
- if (FLAC_HEADER_BASE_SCORE + child_score > header->max_score) {
- /* Keep the child because the frame scoring is dynamic. */
- header->best_child = child;
- header->max_score = base_score + child_score;
- }
- child = child->next;
- }
-
- return header->max_score;
-}
-
-static void score_sequences(FLACParseContext *fpc)
-{
- FLACHeaderMarker *curr;
- int best_score = 0;//FLAC_HEADER_NOT_SCORED_YET;
- /* First pass to clear all old scores. */
- for (curr = fpc->headers; curr; curr = curr->next)
- curr->max_score = FLAC_HEADER_NOT_SCORED_YET;
-
- /* Do a second pass to score them all. */
- for (curr = fpc->headers; curr; curr = curr->next) {
- if (score_header(fpc, curr) > best_score) {
- fpc->best_header = curr;
- best_score = curr->max_score;
- }
- }
-}
-
-static int get_best_header(FLACParseContext* fpc, const uint8_t **poutbuf,
- int *poutbuf_size)
-{
- FLACHeaderMarker *header = fpc->best_header;
- FLACHeaderMarker *child = header->best_child;
- if (!child) {
- *poutbuf_size = av_fifo_size(fpc->fifo_buf) - header->offset;
- } else {
- *poutbuf_size = child->offset - header->offset;
-
- /* If the child has suspicious changes, log them */
- check_header_mismatch(fpc, header, child, 0);
- }
-
- if (header->fi.channels != fpc->avctx->channels ||
- !fpc->avctx->channel_layout) {
- fpc->avctx->channels = header->fi.channels;
- ff_flac_set_channel_layout(fpc->avctx);
- }
- fpc->avctx->sample_rate = header->fi.samplerate;
- fpc->pc->duration = header->fi.blocksize;
- *poutbuf = flac_fifo_read_wrap(fpc, header->offset, *poutbuf_size,
- &fpc->wrap_buf,
- &fpc->wrap_buf_allocated_size);
-
-
- if (fpc->pc->flags & PARSER_FLAG_USE_CODEC_TS){
- if (header->fi.is_var_size)
- fpc->pc->pts = header->fi.frame_or_sample_num;
- else if (header->best_child)
- fpc->pc->pts = header->fi.frame_or_sample_num * header->fi.blocksize;
- }
-
- fpc->best_header_valid = 0;
- fpc->last_fi_valid = 1;
- fpc->last_fi = header->fi;
-
- /* Return the negative overread index so the client can compute pos.
- This should be the amount overread to the beginning of the child */
- if (child)
- return child->offset - av_fifo_size(fpc->fifo_buf);
- return 0;
-}
-
-static int flac_parse(AVCodecParserContext *s, AVCodecContext *avctx,
- const uint8_t **poutbuf, int *poutbuf_size,
- const uint8_t *buf, int buf_size)
-{
- FLACParseContext *fpc = s->priv_data;
- FLACHeaderMarker *curr;
- int nb_headers;
- const uint8_t *read_end = buf;
- const uint8_t *read_start = buf;
-
- if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
- FLACFrameInfo fi;
- if (frame_header_is_valid(avctx, buf, &fi)) {
- s->duration = fi.blocksize;
- if (!avctx->sample_rate)
- avctx->sample_rate = fi.samplerate;
- if (fpc->pc->flags & PARSER_FLAG_USE_CODEC_TS){
- fpc->pc->pts = fi.frame_or_sample_num;
- if (!fi.is_var_size)
- fpc->pc->pts *= fi.blocksize;
- }
- }
- *poutbuf = buf;
- *poutbuf_size = buf_size;
- return buf_size;
- }
-
- fpc->avctx = avctx;
- if (fpc->best_header_valid)
- return get_best_header(fpc, poutbuf, poutbuf_size);
-
- /* If a best_header was found last call remove it with the buffer data. */
- if (fpc->best_header && fpc->best_header->best_child) {
- FLACHeaderMarker *temp;
- FLACHeaderMarker *best_child = fpc->best_header->best_child;
-
- /* Remove headers in list until the end of the best_header. */
- for (curr = fpc->headers; curr != best_child; curr = temp) {
- if (curr != fpc->best_header) {
- av_log(avctx, AV_LOG_DEBUG,
- "dropping low score %i frame header from offset %i to %i\n",
- curr->max_score, curr->offset, curr->next->offset);
- }
- temp = curr->next;
- av_freep(&curr->link_penalty);
- av_free(curr);
- fpc->nb_headers_buffered--;
- }
- /* Release returned data from ring buffer. */
- av_fifo_drain(fpc->fifo_buf, best_child->offset);
-
- /* Fix the offset for the headers remaining to match the new buffer. */
- for (curr = best_child->next; curr; curr = curr->next)
- curr->offset -= best_child->offset;
-
- fpc->nb_headers_buffered--;
- best_child->offset = 0;
- fpc->headers = best_child;
- if (fpc->nb_headers_buffered >= FLAC_MIN_HEADERS) {
- fpc->best_header = best_child;
- return get_best_header(fpc, poutbuf, poutbuf_size);
- }
- fpc->best_header = NULL;
- } else if (fpc->best_header) {
- /* No end frame no need to delete the buffer; probably eof */
- FLACHeaderMarker *temp;
-
- for (curr = fpc->headers; curr != fpc->best_header; curr = temp) {
- temp = curr->next;
- av_freep(&curr->link_penalty);
- av_free(curr);
- fpc->nb_headers_buffered--;
- }
- fpc->headers = fpc->best_header->next;
- av_freep(&fpc->best_header->link_penalty);
- av_freep(&fpc->best_header);
- fpc->nb_headers_buffered--;
- }
-
- /* Find and score new headers. */
- /* buf_size is to zero when padding, so check for this since we do */
- /* not want to try to read more input once we have found the end. */
- /* Note that as (non-modified) parameters, buf can be non-NULL, */
- /* while buf_size is 0. */
- while ((buf && buf_size && read_end < buf + buf_size &&
- fpc->nb_headers_buffered < FLAC_MIN_HEADERS)
- || ((!buf || !buf_size) && !fpc->end_padded)) {
- int start_offset;
-
- /* Pad the end once if EOF, to check the final region for headers. */
- if (!buf || !buf_size) {
- fpc->end_padded = 1;
- buf_size = MAX_FRAME_HEADER_SIZE;
- read_end = read_start + MAX_FRAME_HEADER_SIZE;
- } else {
- /* The maximum read size is the upper-bound of what the parser
- needs to have the required number of frames buffered */
- int nb_desired = FLAC_MIN_HEADERS - fpc->nb_headers_buffered + 1;
- read_end = read_end + FFMIN(buf + buf_size - read_end,
- nb_desired * FLAC_AVG_FRAME_SIZE);
- }
-
- if (!av_fifo_space(fpc->fifo_buf) &&
- av_fifo_size(fpc->fifo_buf) / FLAC_AVG_FRAME_SIZE >
- fpc->nb_headers_buffered * 20) {
- /* There is less than one valid flac header buffered for 20 headers
- * buffered. Therefore the fifo is most likely filled with invalid
- * data and the input is not a flac file. */
- goto handle_error;
- }
-
- /* Fill the buffer. */
- if ( av_fifo_space(fpc->fifo_buf) < read_end - read_start
- && av_fifo_realloc2(fpc->fifo_buf, (read_end - read_start) + 2*av_fifo_size(fpc->fifo_buf)) < 0) {
- av_log(avctx, AV_LOG_ERROR,
- "couldn't reallocate buffer of size %"PTRDIFF_SPECIFIER"\n",
- (read_end - read_start) + av_fifo_size(fpc->fifo_buf));
- goto handle_error;
- }
-
- if (buf && buf_size) {
- av_fifo_generic_write(fpc->fifo_buf, (void*) read_start,
- read_end - read_start, NULL);
- } else {
- int8_t pad[MAX_FRAME_HEADER_SIZE] = { 0 };
- av_fifo_generic_write(fpc->fifo_buf, pad, sizeof(pad), NULL);
- }
-
- /* Tag headers and update sequences. */
- start_offset = av_fifo_size(fpc->fifo_buf) -
- ((read_end - read_start) + (MAX_FRAME_HEADER_SIZE - 1));
- start_offset = FFMAX(0, start_offset);
- nb_headers = find_new_headers(fpc, start_offset);
-
- if (nb_headers < 0) {
- av_log(avctx, AV_LOG_ERROR,
- "find_new_headers couldn't allocate FLAC header\n");
- goto handle_error;
- }
-
- fpc->nb_headers_buffered = nb_headers;
- /* Wait till FLAC_MIN_HEADERS to output a valid frame. */
- if (!fpc->end_padded && fpc->nb_headers_buffered < FLAC_MIN_HEADERS) {
- if (buf && read_end < buf + buf_size) {
- read_start = read_end;
- continue;
- } else {
- goto handle_error;
- }
- }
-
- /* If headers found, update the scores since we have longer chains. */
- if (fpc->end_padded || fpc->nb_headers_found)
- score_sequences(fpc);
-
- /* restore the state pre-padding */
- if (fpc->end_padded) {
- int warp = fpc->fifo_buf->wptr - fpc->fifo_buf->buffer < MAX_FRAME_HEADER_SIZE;
- /* HACK: drain the tail of the fifo */
- fpc->fifo_buf->wptr -= MAX_FRAME_HEADER_SIZE;
- fpc->fifo_buf->wndx -= MAX_FRAME_HEADER_SIZE;
- if (warp) {
- fpc->fifo_buf->wptr += fpc->fifo_buf->end -
- fpc->fifo_buf->buffer;
- }
- buf_size = 0;
- read_start = read_end = NULL;
- }
- }
-
- for (curr = fpc->headers; curr; curr = curr->next) {
- if (curr->max_score > 0 &&
- (!fpc->best_header || curr->max_score > fpc->best_header->max_score)) {
- fpc->best_header = curr;
- }
- }
-
- if (fpc->best_header) {
- fpc->best_header_valid = 1;
- if (fpc->best_header->offset > 0) {
- /* Output a junk frame. */
- av_log(avctx, AV_LOG_DEBUG, "Junk frame till offset %i\n",
- fpc->best_header->offset);
-
- /* Set duration to 0. It is unknown or invalid in a junk frame. */
- s->duration = 0;
- *poutbuf_size = fpc->best_header->offset;
- *poutbuf = flac_fifo_read_wrap(fpc, 0, *poutbuf_size,
- &fpc->wrap_buf,
- &fpc->wrap_buf_allocated_size);
- return buf_size ? (read_end - buf) : (fpc->best_header->offset -
- av_fifo_size(fpc->fifo_buf));
- }
- if (!buf_size)
- return get_best_header(fpc, poutbuf, poutbuf_size);
- }
-
-handle_error:
- *poutbuf = NULL;
- *poutbuf_size = 0;
- return buf_size ? read_end - buf : 0;
-}
-
-static av_cold int flac_parse_init(AVCodecParserContext *c)
-{
- FLACParseContext *fpc = c->priv_data;
- fpc->pc = c;
- /* There will generally be FLAC_MIN_HEADERS buffered in the fifo before
- it drains. This is allocated early to avoid slow reallocation. */
- fpc->fifo_buf = av_fifo_alloc_array(FLAC_MIN_HEADERS + 3, FLAC_AVG_FRAME_SIZE);
- if (!fpc->fifo_buf) {
- av_log(fpc->avctx, AV_LOG_ERROR,
- "couldn't allocate fifo_buf\n");
- return AVERROR(ENOMEM);
- }
- return 0;
-}
-
-static void flac_parse_close(AVCodecParserContext *c)
-{
- FLACParseContext *fpc = c->priv_data;
- FLACHeaderMarker *curr = fpc->headers, *temp;
-
- while (curr) {
- temp = curr->next;
- av_freep(&curr->link_penalty);
- av_free(curr);
- curr = temp;
- }
- av_fifo_freep(&fpc->fifo_buf);
- av_freep(&fpc->wrap_buf);
-}
-
-AVCodecParser ff_flac_parser = {
- .codec_ids = { AV_CODEC_ID_FLAC },
- .priv_data_size = sizeof(FLACParseContext),
- .parser_init = flac_parse_init,
- .parser_parse = flac_parse,
- .parser_close = flac_parse_close,
-};