Function ff_combine_frame

libavcodec/parser.c:217–302

}

int ff_combine_frame(ParseContext *pc, int next,
                     const uint8_t **buf, int *buf_size)
{
    if (pc->overread) {
        ff_dlog(NULL, "overread %d, state:%"PRIX32" next:%d index:%d o_index:%d\n",
                pc->overread, pc->state, next, pc->index, pc->overread_index);
        ff_dlog(NULL, "%X %X %X %X\n",
                (*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]);
    }

    /* Copy overread bytes from last frame into buffer. */
    for (; pc->overread > 0; pc->overread--)
        pc->buffer[pc->index++] = pc->buffer[pc->overread_index++];

    if (next > *buf_size)
        return AVERROR(EINVAL);

    /* flush remaining if EOF */
    if (!*buf_size && next == END_NOT_FOUND)
        next = 0;

    pc->last_index = pc->index;

    /* copy into buffer end return */
    if (next == END_NOT_FOUND) {
        void *new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size,
                                           *buf_size + pc->index +
                                           AV_INPUT_BUFFER_PADDING_SIZE);

        if (!new_buffer) {
            av_log(NULL, AV_LOG_ERROR, "Failed to reallocate parser buffer to %d\n", *buf_size + pc->index + AV_INPUT_BUFFER_PADDING_SIZE);
            pc->index = 0;
            return AVERROR(ENOMEM);
        }
        pc->buffer = new_buffer;
        memcpy(&pc->buffer[pc->index], *buf, *buf_size);
        memset(&pc->buffer[pc->index + *buf_size], 0, AV_INPUT_BUFFER_PADDING_SIZE);
        pc->index += *buf_size;
        return -1;
    }

    av_assert0(next >= 0 || pc->buffer);

    *buf_size          =
    pc->overread_index = pc->index + next;

    /* append to buffer */
    if (pc->index) {
        void *new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size,
                                           next + pc->index +
                                           AV_INPUT_BUFFER_PADDING_SIZE);
        if (!new_buffer) {
            av_log(NULL, AV_LOG_ERROR, "Failed to reallocate parser buffer to %d\n", next + pc->index + AV_INPUT_BUFFER_PADDING_SIZE);
            *buf_size =
            pc->overread_index =
            pc->index = 0;
            return AVERROR(ENOMEM);
        }